Title: I Cannot Login: Warning: Missing Argument/Cannot Modify Header Last modified: August 21, 2016 --- # I Cannot Login: Warning: Missing Argument/Cannot Modify Header * [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/) * So a client of mine recently asked me to help him update his website. I had never worked with WordPress before, so it all was a bit foreign to me. We wanted to enable a way to download and purchase his music on the site, so I did a bit of research and downloaded the Music Store plugin from the WordPress Website. * Now here is what I see on his public page: dayvehuckett.net Warning: Missing argument 2 for wp_widget() in /home/dayve1/public_html/wp-includes/widgets.php on line 76 * On the top left side of the screen. * the login screen this is what it looks like: * Warning: Missing argument 2 for wp_widget() in /home/dayve1/public_html/wp-includes/ widgets.php on line 76 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/wp-login.php on line 337 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/ wp-includes/widgets.php:76) in /home/dayve1/public_html/wp-login.php on line 349 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/ public_html/wp-includes/pluggable.php on line 717 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/ wp-includes/widgets.php:76) in /home/dayve1/public_html/wp-includes/pluggable. php on line 718 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in/ home/dayve1/public_html/wp-includes/pluggable.php on line 719 Warning: Cannot modify header information – headers already sent by (output started at /home/ dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/wp- includes/pluggable.php on line 720 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/ widgets.php:76) in /home/dayve1/public_html/wp-includes/pluggable.php on line 721 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/ public_html/wp-includes/pluggable.php on line 722 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/ wp-includes/widgets.php:76) in /home/dayve1/public_html/wp-includes/pluggable. php on line 725 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in/ home/dayve1/public_html/wp-includes/pluggable.php on line 726 Warning: Cannot modify header information – headers already sent by (output started at /home/ dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/wp- includes/pluggable.php on line 727 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/ widgets.php:76) in /home/dayve1/public_html/wp-includes/pluggable.php on line 728 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/ public_html/wp-includes/pluggable.php on line 731 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/ wp-includes/widgets.php:76) in /home/dayve1/public_html/wp-includes/pluggable. php on line 732 Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in/ home/dayve1/public_html/wp-includes/pluggable.php on line 733 Warning: Cannot modify header information – headers already sent by (output started at /home/ dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/wp- includes/pluggable.php on line 734 * If I put in the login details and hit enter this is what I see: * arning: Missing argument 2 for wp_widget() in /home/dayve1/public_html/wp-includes/ widgets.php on line 76 * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-login.php on line 337 * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-login.php on line 349 * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-includes/pluggable.php on line 699 * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-includes/pluggable.php on line 700 * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-includes/pluggable.php on line 701 * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-includes/pluggable.php on line 890 * This is all I did prior to seeing these warnings: * Using the URL he sent me to his login page, I logged into his site (This got me to an area where I could edit his page, I think it’s called the admin page?) Anyway, I went to the plugins tab, installed the music store plug-in, but then when I clicked the “Activate” button, I got some errors on the screen. I can’t get back to that screen now because I can’t even login anymore. They were something along the lines of: * Cannot activate because this triggered a fatal error…Or something and then something like this: * Warning: Missing argument 2 for wp_widget() in /home/dayve1/public_html/wp-includes/ widgets.php on line 76 * So, I thought to myself hmm, okay, I have no idea what this means so I’ll just stop. do some research to see what’s going on and continue later… I tried deleting the plugin and it wouldn’t even let me do that. I then got all of the errors listed above. * I can’t believe just downloading a plugin, and trying to activate it could crash the site like this. PLEASE HELP. I’ve read a few forums but have not seen and direct answers. Is this something I will have to fix on his computer, since wordpress is downloaded there, and I assume the installed pluggin is located in the wordpress download folder? * Thank you for any help in advance, * P.S I’m not positive on the version of wordpress he uses, so I estimated 3.7. * -Dan Viewing 15 replies - 1 through 15 (of 30 total) 1 [2](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/page/2/?output_format=md) [→](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/page/2/?output_format=md) * [WPyogi](https://wordpress.org/support/users/wpyogi/) * (@wpyogi) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336008) * You need to use FTP or Cpanel to access the site files on the server – and delete that plugin from the plugins folder – * ``` wp-content plugins ``` * IF that does not work, rename the plugins folder to `plugins.HOLD` * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336011) * Okay thank you, and I assume FileZilla is a good FTP to use? * [WPyogi](https://wordpress.org/support/users/wpyogi/) * (@wpyogi) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336012) * Yep, it’s great! * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336014) * I’m trying to use the website url: dayvehuckett.net as the host. But I’m not getting anywhere… I’m just using anonymous for the username. * Command: USER anonymous Response: 421 Can’t change directory to /var/ftp/ [/] Error: Could not connect to server * I’m totally new to this, all help is very much appreciated. * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336016) * When I try using the username and password that I use to get onto his site, I get this error: * Command: USER dayve Response: 331 User dayve OK. Password required Command: PASS ****** Response: 530 Login authentication failed Error: Critical error Error: Could not connect to server * [WPyogi](https://wordpress.org/support/users/wpyogi/) * (@wpyogi) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336017) * FTP login is not the same as WP login – you need to ask the hosting company for FTP info. * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336020) * Okay thank you. So in this case, I believe he uses GoDaddy as his hosting company, I will have to contact them correct? * [Krishna](https://wordpress.org/support/users/1nexus/) * (@1nexus) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336021) * Have you setup your FTP account at your hosting? If yes, you need to use the username, password, etc. as provided by your host. If you have not done that, try that first. Most servers do not allow anonymous login. * [WPyogi](https://wordpress.org/support/users/wpyogi/) * (@wpyogi) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336022) * Yes, this may be helpful: * [http://support.godaddy.com/help/article/4881/finding-your-hostingftp-login-or-user-name](http://support.godaddy.com/help/article/4881/finding-your-hostingftp-login-or-user-name) * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336024) * Okay thanks guys. I’m working on getting his login details for GoDaddy now. Will check back soon, thanks for all the help! * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336064) * I was able to access files on the server by getting into cPanel. However the plugin that I thought I had installed is not in any of the plugin folders. It must have actually worked when I deleted it. * So I guess that’s not the issue. Any ideas why my issues exist now? Nothing was wrong until I tried installing that plug in. Now I can’t log into wordpress. Any thoughts on how to get the wordpress login working again and getting rid of all the previously mentioned script would be much appreciated! * -Dan * [WPyogi](https://wordpress.org/support/users/wpyogi/) * (@wpyogi) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336065) * I was kind of wondering about that – see if this helps: * [http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F](http://codex.wordpress.org/FAQ_Troubleshooting#How_do_I_solve_the_Headers_already_sent_warning_problem.3F) * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336066) * Thanks. It kind of helps.. If I just download a new version of WordPress, is it possible to just replace these corrupted php files with new ones? I don’t see I how I can find the whitespace or issue in line 337 and 349, and then how to fix it… * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-login.php on line 337 * Warning: Cannot modify header information – headers already sent by (output started at /home/dayve1/public_html/wp-includes/widgets.php:76) in /home/dayve1/public_html/ wp-login.php on line 349 * [WPyogi](https://wordpress.org/support/users/wpyogi/) * (@wpyogi) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336067) * It’s actually this line: * ``` wp-includes/widgets.php:76 ``` * But you can try replacing the whole `wp-includes` folder from the new download. * Thread Starter [Hopkins802](https://wordpress.org/support/users/hopkins802/) * (@hopkins802) * [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/#post-4336068) * There are tons of whitespaces in the wp-login.php… The following 15 lines of error all refer to the pluggable php…So I must have more than one thing wrong here? Or is it possible that a single plugin is the cause of these problems? Viewing 15 replies - 1 through 15 (of 30 total) 1 [2](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/page/2/?output_format=md) [→](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/page/2/?output_format=md) The topic ‘I Cannot Login: Warning: Missing Argument/Cannot Modify Header’ is closed to new replies. ## Tags * [cannot login](https://wordpress.org/support/topic-tag/cannot-login/) * [Cannot modify header information](https://wordpress.org/support/topic-tag/cannot-modify-header-information/) * [missing argument](https://wordpress.org/support/topic-tag/missing-argument/) * [plugin issue](https://wordpress.org/support/topic-tag/plugin-issue/) * In: [Fixing WordPress](https://wordpress.org/support/forum/how-to-and-troubleshooting/) * 30 replies * 4 participants * Last reply from: [Hopkins802](https://wordpress.org/support/users/hopkins802/) * Last activity: [12 years, 6 months ago](https://wordpress.org/support/topic/i-cannot-login-warning-missing-argumentcannot-modify-header/page/2/#post-4336134) * Status: not resolved ## Topics ### Topics with no replies ### Non-support topics ### Resolved topics ### Unresolved topics ### All topics