attempt to call field 'startFromWithinActivity'

When i go to the driver training level and go in to the "beginning" mission. after the first part it gives me this error:

Spoiler

Code:

2265.68447|I|GELua.gameplay_missions_unlocks.| Processed unlock status of missions: 337/387 startable missions, 303/387 visible missions.
2265.70253|I|GELua.gameplay_missions_progress.| Saved Mission Progress for mission id "campaigns/driver_training/013-starting"
2265.70521|I|GELua.lua.utils| true
2265.70525|I|GELua.lua.utils| "campaigns/driver_training/013-starting"
2265.70539|I|GELua| D
2267.51408|I|CEF.MainGEUI#local://local/ui/modules/scenariocontrol/scenariocontrol.js:743| gameplay_missions_missionManager.startFromWithinActivity(gameplay_missions_missions.getMissionById("campaigns/driver_training/003-tightroad"))
2267.52118|E|GameEngineLua| *** FATAL LUA ERROR: [string "line"]:1: attempt to call field 'startFromWithinActivity' (a nil value)
=============== Stack Traceback >> START >>
(1) main chunk of line at line 1
--------------- << END <<

2267.52124|E|GameEngineLua| *** while executing this line: gameplay_missions_missionManager.startFromWithinActivity(gameplay_missions_missions.getMissionById("campaigns/driver_training/003-tightroad"))
2267.52124|E|GameEngineLua| *** in chunk: line

I tried in safe mode and it is still not working