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-robot-start-2

 154.996 Error ClientMultiplayerManager.cpp:1081: mod-robot-start-2 was registered for the following events when the map was saved but has not re-registered them as a result of loading: on_entity_died (ID 4), on_built_entity (ID 6), on_cargo_pod_finished_descending (ID 12), on_robot_built_entity (ID 18), on_research_finished (ID 22), on_marked_for_deconstruction (ID 28), on_player_created (ID 32), on_player_armor_inventory_changed (ID 43), on_player_ammo_inventory_changed (ID 44), on_player_controller_changed (ID 60), on_player_changed_force (ID 66), on_runtime_mod_setting_changed (ID 69), on_robot_mined_entity (ID 73), on_player_mined_entity (ID 74), script_raised_built (ID 92), script_raised_destroy (ID 93), on_player_trash_inventory_changed (ID 124) and on_space_platform_changed_state (ID 195)
 154.996 Error ClientMultiplayerManager.cpp:1110: mod-robot-start-2 had the following event filters when the map was saved: on_entity_died (ID 4) (checksum: 2913651504), on_built_entity (ID 6) (checksum: 2913651504), on_robot_built_entity (ID 18) (checksum: 2913651504), on_marked_for_deconstruction (ID 28) (checksum: 3419690710), on_robot_mined_entity (ID 73) (checksum: 2913651504), on_player_mined_entity (ID 74) (checksum: 2913651504), script_raised_built (ID 92) (checksum: 2913651504) and script_raised_destroy (ID 93) (checksum: 2913651504)
 154.996 Error ClientMultiplayerManager.cpp:1117: mod-robot-start-2 registered the following event filters when the map was loaded: 
 154.996 Error ClientMultiplayerManager.cpp:86: MultiplayerManager failed: "" + multiplayer.script-event-mismatch + "
" + "
mod-robot-start-2"
 154.996 Info ClientMultiplayerManager.cpp:608: UpdateTick(3391890) changing state from(ConnectedLoadingMap) to(Failed)

Additionally, when new player joins the game on the server, they ain't getting the treatment that turns them into godmode and locks their inventory, neither we're getting our inventories edited when technologies expand the inventory slots.

We can circumvent not being able to join the server by loading the save in singleplayer, saving, and then uploading that save to the server, but that's certainly not how this mod is supposed to work.