Having 2 server open should not be the issue. The new artifacts added the “ResultAsLong” function into the Lua files of the artifact. When you run the latest artifacts but the old version of the Lua, it will complain that “ResultAsLong” doesn’t exist.
Normally you would replace the Lua file, but for some reason the new Lua didn’t get overwrite the old ones. Probably because the Lua file was in use by a server or something like that.