Prestashop and "500 Internal Server Error"

[ukdavros]

ok this is driving me nuts using 1.7.3.3

This was working fine after creating .USER.INI file etc got everything working fine. couple of months later  I am now  getting "500 Internal Server Error" when I click on pretty much anything in the back office including preferences

Turned on debugging by editing the file as I cant do it in preferences and everything works in the back office, I can get to anything but the website then comes up with the following, Any ideas please

[ukdavros]

OK

I have got rid of the web page error by disabling "Social media share buttons " module

But still in the back office certain items give me the 500 error, Trying to get into the the following menu items so far

Modules

Products

Performance

works fine in debug mode, where do I see the logs for errors as there doesnt seem to be any errors

Thanks

Mark