The installer runs fine but then I get an internal server error when Advokit tries to load

I followed the instructions and have installed advokit successfully. Following the installation, the page is redirected /index.php and I receive the following Internal Server Error:

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The server encountered an internal error or misconfiguration and was
unable to complete your request.

etc...
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Internal server errors (500 errors) are usually caused by file or directory permission configurations that do not comform to settings required by your server. Most servers will not, for very good reason, allow a php file with public write permissions (777) to execute.

Most of the time that this error is encountered, the solution is to chmod the permissions for your index.php file to 755.