ERROR: index out of range
From The DarkMod Wiki
ERROR: R_RangeCheckIndexes: index out of range
This error will cause the game to exit back to the main menu when trying to load a map. It means there is a problem with an md5mesh in the map you are trying to load. This problem could be:
1. A vert is weighted to a non-existent bone (have not confirmed this)
2. A vert from one layer is present on more than one uv-map
3. A poly has less than 3 verts.