Dear Sir, 

im uploading the dentalpress theme in http://websitedemoz.in/triveni this url, im getting error while im uploading the theme after competing the process im getting an error like this 

This page isn’t working

websitedemoz.in is currently unable to handle this request.

HTTP ERROR 500

please check the following attachment also please solve this issue asap. it is very urgent take it as highly priority

Sir it is very urgent please solve this issue im waiting for your response

After successfully uploading the theme , when im clicking on activate option im getting error,

this is the url http://websitedemoz.in/triveni/wp-admin/themes.php?activated=true

but im getting this error 

This page isn’t working

websitedemoz.in is currently unable to handle this request.

HTTP ERROR 500

i confirm with my server team also, problem with theme

error log : [21-Apr-2018 07:42:33 UTC] PHP Fatal error: Can't use function return value in write context in /home/website/public_html/triveni/wp-content/themes/tf/includes/functions.php on line 145

please solve this issue as soon as possible. it is very very urgent 

Thank You now its working.