If you get an Internal error when trying to edit your pages in MediaWiki, you should first enable debugging by adding the following line at the bottom of the LocalSettings.php file:
$wgShowExceptionDetails = true;
This will give you the exact error message, as well as a backtrace result so that you can see what is causing the problem.
If you get an error message similar to this:
Invalid h node passed to PPNode_DOM::splitHeading
add the following code at the bottom of LocalSettings.php:
$wgParserConf['preprocessorClass'] = 'Preprocessor_Hash';
This should resolve your issue and you will be able to edit your MediaWiki pages again 
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