PHP Fatal error

[18-Dec-2014 06:55:00] PHP Warning: fopen(["http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236e2002\/2014\/12\/Tulips4.jpg","http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236e2002\/2014\/12\/Penguins4.jpg","http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236e2002\/2014\/12\/Lighthouse4.jpg","http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236e2002\/2014\/12\/Koala4.jpg","http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236e2002\/2014\/12\/Jellyfish4.jpg","http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236e2002\/2014\/12\/Hydrangeas4.jpg","http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236e2002\/2014\/12\/Desert4.jpg","http:\/\/nhahalong.com\/wp-content\/uploads\/gravity_forms\/6-115a129b7dbbe96c02565651236 in /home/nha551bb/public_html/wp-content/plugins/gravity-forms-dropbox-uploader/dropbox-api/API.php on line 114
[18-Dec-2014 06:55:00] PHP Warning: stream_get_contents() expects parameter 1 to be resource, boolean given in /home/nha551bb/public_html/wp-content/plugins/gravity-forms-dropbox-uploader/dropbox-api/API.php on line 294
[18-Dec-2014 06:55:01] PHP Fatal error: Uncaught exception ‘Dropbox_Exception_RequestToken’ with message ‘Error: (401) Unauthorized
‘ in /home/nha551bb/public_html/wp-content/plugins/gravity-forms-dropbox-uploader/dropbox-api/OAuth/Curl.php:135
Stack trace:
#0 /home/nha551bb/public_html/wp-content/plugins/gravity-forms-dropbox-uploader/dropbox-api/API.php(302): Dropbox_OAuth_Curl->fetch(‘https://api-con…’, ‘–R50hrfBj5JYyf…’, ‘POST’, Array)
#1 /home/nha551bb/public_html/wp-content/plugins/gravity-forms-dropbox-uploader/dropbox-api/API.php(120): Dropbox_API->multipartFetch(‘https://api-con…’, false, ‘Chrysanthemum4….’)
#2 /home/nha551bb/public_html/wp-content/plugins/gravity-forms-dropbox-uploader/dropbox.php(527): Dropbox_API->putFile(‘Chrysanthemum4….’, ‘[“http:\/\/nhah…’)
#3 [internal function]: GFdropbox::set_post_content(Array, Array)
#4 /home/nha551bb/public_html/wp-includes/plugin.php(505): call_user_func_array(Array, Array)
#5 /home/nha551bb/public_html/wp-content/plugins/gravityforms1818/form_display.php(434): do_action(‘gform_p in /home/nha551bb/public_html/wp-content/plugins/gravity-forms-dropbox-uploader/dropbox-api/OAuth/Curl.php on line 135

I’m stuck when the form can’t transfer files in form to dropbox folder. I think the author should add a test upload file below section Authenticate/Deauthorize Dropbox Account to check if all things are ok. In my case why 401 error caught while the account has been Authenticate. Please help.

https://ww.wp.xz.cn/plugins/gravity-forms-dropbox-uploader/