E2391 Type mismatch in parameter 'parameter' in template class name 'template' (C++)

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The actual template argument value supplied for the given parameter did not exactly match the formal template parameter type.

When compiling C++ programs, this message is always preceded by another message that explains the exact reason for the type mismatch.

That other message is usually "Cannot convert 'type1' to 'type2'" but the mismatch might be due to many other reasons.