impossible de lancer minecraft 21w10a

This report is invalid, as it has been posted in a language other than English. Just to inform you, the bug tracker only handles issues reported in this particular way, as this is the most common language upon Mojang Studios so, if this isn't your main language, and/or you're not fluent in it, you may use an online translator to describe your issue. See the Bug Tracker Guidelines for more information.

What Avoma said is correct, however this is actually a duplicate of MCL-17343.