Imported textures makes the game puke?

I was working on my map for Community Chest 2 and wanted the SLADRIP textures from Doom 1, so I put them into the wad (using Wintex 5.0) but now when I try to load it in PrBoom it crashes with a message "P_InitPicAnims: bad cycle from SLADRIP1 to SLADRIP3". I had previously put in the STAR* textures that are missing from Doom 2 and those worked fine. What went wrong?

you need to have three textures imported
SLADRIP1, SLADRIP2, and SLADRIP3

Thanks, got it working now. I had them in backwards order in the texture list before.