Title: [Plugin: Flattr] Oauth Error: 401
Last modified: August 19, 2016

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# [Plugin: Flattr] Oauth Error: 401

 *  Resolved [Akalevin](https://wordpress.org/support/users/akalevin/)
 * (@akalevin)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/plugin-flattr-oauth-error-401/)
 * Hi there,
 * when I try to publish a new article (clicking on the Publish button) I receive
   this horrible error…
 * OAuth Error:401
    Fatal error: Class ‘OAuthSignatureMethod_HMAC_SHA1’ not found
   in /web/htdocs/www.indievault.it/home/wp-content/plugins/flattr/oAuth/flattr_rest.
   php on line 27
 * anyway, even if I have this error, the articles are still published on the blog,
   but it’s really annoying. I’ve tried to contact my host service (the Italian 
   Aruba) but they disabled the plugin (so my articles were just screwed – [http://yfrog.com/gyvqh5j](http://yfrog.com/gyvqh5j))
 * I’ve reactivated the plugin but I hope you can help me. Actually I’ve WP 3.0.5
   and Flattr 0.9.23
 * [http://wordpress.org/extend/plugins/flattr/](http://wordpress.org/extend/plugins/flattr/)

Viewing 4 replies - 1 through 4 (of 4 total)

 *  Plugin Contributor [Michael Henke](https://wordpress.org/support/users/aphex3k/)
 * (@aphex3k)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/plugin-flattr-oauth-error-401/#post-1952671)
 * Hi,
 * this looks like a side effect of using other plugins that use oAuth procedure
   as well. Can you post (or mail) me a list of what other plugins your running?
 * If available publicly I can test them against flattr plugin and see what I can
   do.
 *  Thread Starter [Akalevin](https://wordpress.org/support/users/akalevin/)
 * (@akalevin)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/plugin-flattr-oauth-error-401/#post-1952692)
 * Hi Michael, thank you for the reply. Maybe it’s Tweet On Post? (it doesn’t work
   since some days). Anyway, here’s the list:
 *  Advertising Manager
 *  Akismet
 *  All in One SEO Pack
 *  Custom Smilies
 *  FaceBook Share (New)
 *  FancyBox for WordPress
 *  FD Feedburner Plugin
 *  Flattr
 *  Google XML Sitemaps
 *  Tweet On Post
 *  Ultimate Google Analytics
 *  WordBB – WP side
 *  WP-Polls
 *  WP Minify
 *  WP No Category Base
 *  WPtouch
 *  Yet Another Related Posts Plugin
 *  Plugin Contributor [Michael Henke](https://wordpress.org/support/users/aphex3k/)
 * (@aphex3k)
 * [15 years, 3 months ago](https://wordpress.org/support/topic/plugin-flattr-oauth-error-401/#post-1952771)
 * Please update to 0.9.23.1 as soon as it is available later today. If you problem
   persists, please report back!
 *  Thread Starter [Akalevin](https://wordpress.org/support/users/akalevin/)
 * (@akalevin)
 * [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-flattr-oauth-error-401/#post-1952898)
 * now it works 🙂 Thank you Michael

Viewing 4 replies - 1 through 4 (of 4 total)

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 * 4 replies
 * 2 participants
 * Last reply from: [Akalevin](https://wordpress.org/support/users/akalevin/)
 * Last activity: [15 years, 2 months ago](https://wordpress.org/support/topic/plugin-flattr-oauth-error-401/#post-1952898)
 * Status: resolved