This issue only affects Firestorm 126.96.36.19925 Mesh Beta release
Firestorm 188.8.131.5266 Mesh Beta Maintenance Release is patched against this bug.
You can download the Maintenance release here
See FIRE-3128 for details on this bug
Unfortunately a skin bug that wasnt discovered in the internal testing stages in one of the Firestorm skins in the Firestorm Mesh Beta
release is triggering a serverside issue that is causing both the Firestorm team and Linden Lab headaches.
If you use the Metaharper skin on Firestorm 3.0.1 (22525) Mesh Beta release and then try to restart your region-
You can fix this issue in your already installed copy of Firestorm by just deleting one skin file.
Please note: If you have already attempted a failed restart using Firestorm on the Metaharper skin, You will need to contact Linden Lab to have the region restarted or wait for the next server rollout.