We have developed a small, simple plugin for Confluence. However, when we try to install the plugin on Confluence 3.4.9, we are receiving the following error:
Invalid anti-XSRF token provided. The valid token should be retrieved transparently, but you may want to perform a hard refresh in your browser and try again before creating a support issue.
Why are we getting this error? Is there something wrong in the plugin itself which could cause this error?