HTTP ERROR 500

[Xaner4]

Hey 
I am getting a error 500 code when i try to open the webinterface it did work before i did upgrade ubuntu from 14.04 to 16.04 And php5 to php7 (because ubuntu 16.04 have stoped supporting php5)
if i try wordpress or any other php site on the server they work fine but your webinterface bring me HTTP ERROR 500.
I have tried to reinstall the webpanal with the newest update

Sorry for my bad English :/

[Stefan1200]

Maybe the PHP MySQL package is missing?

[Xaner4]

I know that i have had it installed and i have tryed reinstalling it many times, but when you said it now i tried again and now it works thanks