Im trying to make a test map for a custom weapon i made. But when I try to build the cache-file, it comes up with this error

03.10.08 13:44:03 tool pc 01.00.00.0609 ----------------------------------------------
03.10.08 13:44:03 reference function: _write_to_error_file
03.10.08 13:44:03 reference address: 42ca20
03.10.08 13:44:03 Couldn't read map file './toolbeta.map'
03.10.08 13:44:06 crosshair item 0 for weapons\missile_pod\missile_pod references an invalid sequence

What does it mean and how can I fix this?
My Crosshair bitmap has 1 sprite in it when I made it.