The Kunena team has announce the arrival of Kunena 184.108.40.206 [K 220.127.116.11] which is now available for download as a native Joomla extension for J! 4.2.x. This version addresses most of the issues that were discovered in K 6.0 and issues discovered during the development stages of K 6.0.
The error code HTTP 500 Internal Server Error is a general-purpose message this indicates a general error in a web application. Please note that there is no general solution for this general error. You should first read HTTP 500 Internal Server Error
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Thank you for the help.
The version of Kunena is the latest (1.7.2) on your website, I don't know the version of community builder because I didn't use it. I've disabled it and now the error is:
Fatal Error: Call to a member function getCfg() on a non-object in components/com_comprofiler/plugin.foundation.php on line 2030
The error was detected in the Comprofiler Component.
I don't know if it might help, but it is a J1.5 migrated to 2.5