Out of Sync error and then game crashes

[Xeroth]

I am trying to play with my friend on Hamachi, when I first go in it says Out of Sync Error and what not and if I close my game and restart then try to join, this comes up.

Assertion failed: "cmpRangeManager"

Location: Selection.cpp:38 (EntitySelection::PickEntitiesAtPoint)

Call stack:

(error while dumping stack: No stack frames found)

errno = 13 (Insufficient access rights to open file)

OS error = 0 (no error code was set)

[historic_bruno]

Are you both using the exact same version of 0 A.D.? If so, it would be helpful to see both of your oos_dump logs, you can find them in the game's log folder (look for oos_dump.txt, and you may need to zip it first, if too big to attach here)