It says
Whoops!
An unexpected issue occured; we are sorry for the inconvenience. Please try restarting your launcher. If that does not resolve, please log a bug report
Environment
Linux Arch Kde Plasma Xwayland, starting from curseforge launcher
MCL-25889
Minecraft Launcher can't start properly
Resolved
Duplicate
5
I have the same issue since yesterday. I bought the game yesterday, then played it for a while, closed it, tried to open it again and this message showed up. Also on Linux.