I have errors appearing on forum, above all the content: Warning:

Undefined array key "capabilities" in /home/lifeleap/public_html/community/wp-includes/class-wp-roles.php on line 292

Any ideas on what this error might be related or what I can do to troubleshoot/fix this issue?

Thank you for any help.

[@robin-w Moderator 21 hours, 43 minutes ago]

as with your other question

Themes

As a test switch to a default theme such as twentytwenty, and see if this fixes.

Plugins

If that doesn’t work, also deactivate all plugins apart from bbpress and see if this fixes. if it does, re-enable one at a time to see which is causing the error.

If you cannot do this to your site (say because it is live) then use the ‘troubleshooting’ features of this plugin to let you test without affecting other users

Health Check & Troubleshooting

Then come back