The game in 'D:\Games\Grim\' seems to be unknown.
Please, report the following data to the ResidualVM team along with name
of the game you tried to add and its version/language/etc.:
{"VOX0001.LAB", 0, "a38708ba97960ee7ee59218489a485eb", 44691160},
As a workaround you could install the original game again, add it to residualvm, then start. It will complain about the MD5s but allow you to continue.
Option B: add a section to your residualvmrc for the game.