Thank you for the fixes, Kyle.   I've also edited the location of the themes so we're good there too.

The last couple of issues that I am seeing now:

1.  None of the Kunena activities are appearing in the front-end feed. (I suspect this may have something to do with a failed migration from CBActivity 5 > 6)

 

When I went to see the logs in the backend 
2. A new issue popped up when I tried to sort the activity by type.  This error shows up I can't see any of the activities in the back end.

 
 

Enable debug mode and maximum error reporting in Joomla global configuration then retry. That should expose where the error is coming from in its callstack. I need that callstack to track down the cause.

Seem like I am getting a bunch of error messages when enabling the maximum or development error reporting so I downgraded to PHP 8.0 to get the call stack
(Can't wait to get away from J3)

Deprecated: Joomla\Input\Input implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /home/.../libraries/vendor/joomla/input/src/Input.php on line 41

Deprecated: Return type of Joomla\Input\Input::count() should either be compatible with Countable::count(): int, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/.../libraries/vendor/joomla/input/src/Input.php on line 170

Deprecated: Joomla\CMS\Input\Input implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /home/.../libraries/src/Input/Input.php on line 31

Warning: session_name(): Session name cannot be changed after headers have already been sent in /home/.../libraries/joomla/session/handler/native.php on line 128

Deprecated: Joomla\CMS\Input\Cookie implements the Serializable interface, which is deprecated. Implement __serialize() and __unserialize() instead (or in addition, if support for old PHP versions is necessary) in /home/t.../libraries/src/Input/Cookie.php on line 21

Warning: session_cache_limiter(): Session cache limiter cannot be changed after headers have already been sent in /home/t.../libraries/joomla/session/handler/native.php on line 235
Error: Failed to start application: Failed to start the session because headers have already been sent by "/home/.../libraries/vendor/joomla/input/src/Input.php" at line 41.

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Anyway, here is the info you need.

An error has occurred.
0 count(): Argument #1 ($value) must be of type Countable|array, null given
/home/.../libraries/CBLib/CBLib/AhaWow/Controller/Elements/TableBrowser.php:2984