Doesnt work on multiplayer. I cant join my friends server cause it gives an error.

What exactly does the error message say? Maybe I can fix it if you give me some more details...

96.702 Error ClientMultiplayerManager.cpp:1123: mod-a-space-exploration-fixer was registered for the following events when the map was saved but has not re-registered them as a result of loading: on_tick (ID 0)
96.702 Error ClientMultiplayerManager.cpp:101: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-a-space-exploration-fixer"
96.702 Info ClientMultiplayerManager.cpp:592: UpdateTick(474) changing state from(ConnectedLoadingMap) to(Failed)