In my experience Math Type sometimes leaves an auto load registry key which points to the now removed addin and causes this error.
If you know how to search the registry search the HKLM hive for MathType Addin. If the key exists delete it.
If you are confident working in the registry the key is likely to be at :
HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\ Office\16.0\PowerPoint\AddIns\MathType AddIn
If you are not sure about deleting the key double click and change the value of AutoLoad to 0 which will prevent it trying to load.
Sorry it seems complicated but it is!
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