The imports show Clarion name mangling “@Fl” so was the DLL was made with another Clarion APP?
If yes then you should not need to make a .LIB with LibMaker because the build makes a .LIB … but it is confusing that the LIB is in the OBJ Release or Debug folder…
… Do this so build of the DLL APP puts the LIB in your EXE / DLL folder: