You are using years old renpy 8.1 which I don't remember I ever tested guiManipulate against.
Looking at renpy source code of version 8.1.3.23091805, that module is actually not there. However, it is there for renpy 8.2. Are you willing to try upgrading the renpy version you use to version 8.2 and try again? Or maybe try upgrading to latest version.