So I am 2 trophies away from platinum just need to finish the brotherhood quest line


so on the mission Liberty reprimed every time I talk with the machinists lady she says come with me the game crashes with this error.


I have tried an older save a replaying a chunk but when I got there it crashed again I have uninstalled and reinstalled no good and I have not found a fix online


Hope you can help as after 100 hours of gameplay not being able to finish it is maddening