FTP theme Upload

After Uploading and Activating my desires theme bigger than 10MB via FTP,
my website gives me,

This page isn’t working

domainname.com is currently unable to handle this request.


Please help me resolve the issue to use my theme.
thanks in advance

HTTP ERROR 500 could mean many things. Did you try to figure out yourself what’s happening? This article is a good place to start: https://infinityfree.net/support/http-error-500/