/.htaccess: AllowOverride not allowed here
Please see:
https://stackoverflow.com/questions/35508635/allowoverride-not-allowed-here
So there is something in an .htaccess file in /data/ and in your document root ... the public_html directory that your web service doesn't like.
So what's in those .htaccess files? And what are you running for a web service? apache? nginx? lightspeed?
'SoS', Ken