Problem

After updating Confluence UPM they unable to access ADD-ONS page

The following appears in the Atlassian.log

2015-08-20 11:47:30,992 WARN [http-bio-8090-exec-7] [confluence.plugins.soy.VelocityFriendlySoyTemplateRenderer] getRenderedTemplateHtml Error while rendering the template com.atlassian.plugins.atlassian-nav-links-plugin:rotp-menu:navlinks.templates.appswitcher.switcher.soy
com.atlassian.confluence.renderer.template.TemplateRenderingException: Unable to compile Soy templates at: com.atlassian.plugins.atlassian-nav-links-plugin:rotp-menuDiagnosis

Cause

Plugin cache is corrupted

Resolution

Clear Plugin cache:

1. Shutdown Confluence
2. Ensure the user running Confluence has full read/write privileges to the confluence-home directory.
3. Remove the following directories
    This will remove the plugin cache files only and will not permanently remove any plugins. These directories will be recreated during the next Confluence startup.  However, some third-party plugins may store metadata in these directories, so we recommend creating a temporary backup of the directories.
   
   • <confluence-home>/bundled-plugins
   • <confluence-home>/plugins-cache
   • <confluence-home>/plugins-osgi-cache
   • <confluence-home>/plugins-temp
   • <confluence-home>/bundled-plugins_language
4. Start Confluence