HaloMods "Classic" Read-only Archive

I am working on a custom turret, but in tool when I try to compile the physics it says,

"07.03.07 16:28:39 tool pc 01.00.00.0609 ----------------------------------------------
07.03.07 16:28:39 reference function: _write_to_error_file
07.03.07 16:28:39 reference address: 42ca20
07.03.07 16:28:39 Couldn't read map file './toolbeta.map'
07.03.07 16:28:43 EAX: 0xFFFFFFFE
07.03.07 16:28:43 EBX: 0x0021FC01
07.03.07 16:28:43 ECX: 0x0013F570
07.03.07 16:28:43 EDX: 0x000002CC
07.03.07 16:28:43 EDI: 0x0013F570
07.03.07 16:28:43 ESI: 0x00000000
07.03.07 16:28:43 EBP: 0x0013F448
07.03.07 16:28:43 ESP: 0x0013F438
07.03.07 16:28:43 EIP: 0x7C90EB94, C3 8D A4 24 ?????
07.03.07 16:28:43 EXCEPTION halt in \halopc\haloce\source\math\matrix_math.c,#1109: !realcmp(determinant, 0.0f)"

What the hell does "!realcmp(determinant, 0.0f)" mean???

I've been getting that alot too. I have no idea what it means.