Can`t find theme.php error

Hi there
After migrating from one server to another. Muffin options is not showing. 
When I check the inspect element console I see:

Failed to load resource: the server responded with a status of 500 (Internal Server Error) theme.php

I have checked that all dns zones are updated to new server.
Saved permlinks , and all that jazz. 

What do I do now? 

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