Error LNK2019 unresolved external symbol _main referenced in function “int __cdecl invoke_main(void)” (?invoke_main@@YAHXZ)

Similar to @仲耀晖 I had the wrong application type configured for a dll. I guess that the project type changed due to some bad copy pasting, as @Daniel Struhl suggested.

How to verify: Right click on the project -> properties -> Configuration Properties -> General -> Project Defaults -> Configuration Type.

Check if this field contains the correct type, e.g. "Dynamic Library (.dll)" in case the project is a dll.