C++ : error: invalid conversion from 'void (*)()' to 'void (*)()' -- what?

C++ : error: invalid conversion from 'void (*)()' to 'void (*)()' -- what?
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C++ : error: invalid conversion from 'void (*)()' to 'void (*)()' -- what?
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from : 'void error: 'void (*)()' C++ -- (*)()' conversion to invalid what?