I just installed the theme on my wordpress site but there seams to be a problem as i have done the validation and upgraded to PRO version. The problem occurs when trying to access any theme customisation tools.
Hello @averkios,
Thanks for asking. 
There could be multiple reasons for 500 error message. I suggest you to please take a look at following article for some solutions on fixing 500 error message.
Let us know how it goes.
Thanks.
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