fatal error LNK1120: 1 unresolved externals

Experiment error note.

OpenGL.obj : error LNK2001: unresolved external symbol “public: __thiscall CGLFont::CGLFont(void)” (??0CGLFont@@QAE@XZ)
Exe: Fatal Error lnK1120:1 Unresolved Externals

Error message: Unresolvable external symbol “public: Thiscall CGLFont::CGLFont(void)” code refers to content (such as functions, variables, or labels) that the linker cannot find in the library and object files.
some people on the Internet say there are two possible reasons: “1. The program lacks lib files in project -> 2. Add the required lib file to the link in setting.”

“2. In a program, functions are only declared undefined, and this problem is most likely caused by misspelling the name of the function when defining the function.”

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