This is due to a recent update on the Truenas side that means apps require 24.10.2.2 build to work, HexOS is still running the 24.10.0 build. It will be updated soon in the Q2 update, but if you can't wait for that, you can manually upgrade your system to 24.10.2.2 if comfortable to do so. Also it's be advised DONT go to 25.0 builds.