Cannot restart mission of transporting construction semi-trailer

Everytime I go to restart the mission, an error appears saying to check the trailer spawn area for obstructions (there aren't any) and try again. I've tried restarting etc. but none of it has fixed it. This is on Black river.

I have this same problem.

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This is pretty much preventing me to progress, I think... Other contracts are dependent of this one.

I guess I can always go scouting Russia...

last edited by Bergele