So, I did some testing...
The file that was in error was the war3err.dll included in the beta grimoire pack. When I replaced it with the one in RtC's pack, everything started working (both loading RtC map [first error] and using triggers [second error]).
So, as long as a good war3err.dll is included, the Grimoire pack should be fine (as far as I can see XD)...