I can't help with Visustella scripts, since they are closed code and all. Most of plugins that don't belong to their suite are incompatible with a project with any of their plugins, as far as I know (rpg maker web forums is flooded in people answering that). As for running it without other plugins, did you add ME_CopyActors somewhere above it, or ran it on its own? (It's an extension for CopyActors, it won't work if it's not there).
Also, could you show me the trace error log of running it without Visustella suite? And just in case, the corescript version (Game > Update Corescript)?