Impossible to launch the game

Hello,

Since today I can't lanch PoE any more. When I try, these error messages appear :
Spoiler

followed after validation by


Some additionnal precisions that may be useful : I play through the Steam client and the last time the game launched successfully was yesterday, just before the realm restarted for the release of the 2.1.2b patch.
Verify the cache/installation for Path of Exile within Steam.

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