When joining my friends game, I get all the way to the load to catch up segment, then i receive an error screen of:
"Cannot join. The following mod event handlers are not identical between you and the server. This indicates that the following mods are not multiplayer (save/load) safe. (See the log file for more details):

mod-miniloader-redux"

When checking the log:"
"302.075 Error ClientMultiplayerManager.cpp:1078: mod-miniloader-redux was not registered for the following events when the map was saved but has registered them as a result of loading: on_tick (ID 0)
302.075 Error ClientMultiplayerManager.cpp:85: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-miniloader-redux"
302.076 Info ClientMultiplayerManager.cpp:607: UpdateTick(184350589) changing state from(ConnectedLoadingMap) to(Failed)"

Please let me know if you need any other info.

thanks. I have not actually tried it in multiplayer but will do so. Do you have the same version of the mod on your client and the server?

Yes.. even deleted the mod and register from the local machine for redownload when connecting. Same error.