I am getting the following error.

Severity Code Description Project File Line Suppression State

Error LNK2019 unresolved external symbol "public: __thiscall Interface::Interface(void)" (??0Interface@@QAE@XZ) referenced in function _main Project82 C:\Users\Owner\source\repos\Project82\Project82\main.obj 1

Error LNK2019 unresolved external symbol "public: int __thiscall Interface::getGridSize(void)" (?getGridSize@Interface@@QAEHXZ) referenced in function _main Project82 C:\Users\Owner\source\repos\Project82\Project82\main.obj 1

I am unsure of how to proceed.

Severity Code Description Project File Line Suppression State

Error C2252 an explicit instantiation of a template can only occur at namespace scope Project83 c:\users\owner\desktop\glui-2.36\glui-2.36\src\include\gl\glui.h 1720

Error C2252 an explicit instantiation of a template can only occur at namespace scope Project83 c:\users\owner\desktop\glui-2.36\glui-2.36\src\include\gl\glui.h 1721

I fixed the above error, but I am getting a new one.

From the timestamps, you tried less than an hour (possibly no time at all) to fix the second set of errors yourself before posting.

That's just sad and lazy.

So if you're still having issues, try using the latest version of glui. From what I could find, it is an issue from before 2015.

https://github.com/libglui/glui/commit/85b8038d9dbe415b327480d6bffd008a0e79c382​

Or maybe you're calling glui incorrectly.