I have the attached CalmoSoft Fifteen Puzzle Game program.
It was developed in Visual Prolog 7.5. Personal Edition.
Now I installed Visual Prolog 8.0 Personal Edition.
I get the next error message (and some others):
error lnk2525 : Error 2525: 'Obj\controlsupport.CC709277.obj' - undefined name 'class$textControl'
I do not know whether it helps, but I can tell that after "Rebuild All" and another "Build" with always clicking "Remove All" resp. "Add All" when promted your project works in VIP 8 Commercial Ed.
The error comes because the implementation of the textControl class in not in the project. That is because the textControl package has not been added to the project.
You can add it manually (it is in pfc\gui\controls\textControl), but if you use "Rebuild All" you should be prompted about it.