Symptoms

When trying to access core functionality of JIRA, a system error appears in the browser with the message "Oh, it seems that we've lost a page. Maybe you should raise an issue?". The URL does not contain any "/plugin" component, so is part of JIRA core.

Cause

There could be multiple causes of this error occurring:

1. The file relating to that page have been modified or are missing. You should be able to see if there are any modifications by looking in the JIRA log for the "Modifications" section shortly after JIRA starts, by default it will usually look like this, so if there are any extra files listed, they might be related to this issue:

   ___ Modifications ___________________________
        Modified Files                                : jira-application.properties
        Removed Files                                 : None
   
   

2. The permissions on the JIRA home directory may be incorrect, preventing access to required files to generate the page. This can happen sometimes due to changing which user is running JIRA.

Resolution

• For cause 1 you can check the Modifications section in the JIRA log, and rectify anything that is modified or missing related to the page. The default without any modifications would look like:

  ___ Modifications ___________________________
       Modified Files                                : jira-application.properties
       Removed Files                                 : None

• For cause 2, you can check the permissions are correct for the JIRA home directory, for example on Linux, if the JIRA user is "jira", and that user's primary group is "jira", you could run the below commands (remember to replace <jira-home> with the actual directory, and jira:jira with the correct user:group for your system):

  chown -R jira:jira <jira-home>
  chmod -R u+rwX,go+rX <jira-home>