ASSERTION FAILURE: Format==WW3D_FORMAT_DXT1 || Format==WW3D_FORMAT2 || Format==WW3D_FORMAT_DXT3 || Format==WW3D_FORMAT_DXT4 || Format==WW3D_FORMAT_DXT5, C:\projects\GeneralsMD\Staging\code\Libraries\Source\WWVegas\WW3D2\ddsfile.cpp, 78

i am assuming this error is preventing me to add any new content to my mod, all new textures just appear black.

try checking ReleaseCrashInfo in MyDocuments/CommandandConquerGeneralsData, it might tell you where your problem is

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What uses WW3D....models are W3D format right (3d shockwave I think it means)? What have you tried adding to the mod? And when does this error happen (build a unit with a new model? Build a unit with a new texture?)? Also, do you know anything about that filepath (C:\projects\GeneralsMD\Staging\code\Libraries...)? I would expect, since it's a c++ file, that it would be part of what Generals installed, but that's an odd path that you would have installed to, and it isn't like in Command and Conquer Generals Data.

I can tell you it's a format problem (You aren't using WW3D_FORMAT_DXT1 or WW3D_FORMAT_DXT2 etc which are probably defined as a file format that the game is trying to import), which since it's WW3D I'm going to guess is for models (3d shockwave). So the most likely cause is that you're trying to use a model that isn't a .w3d file.

Westwood 3D - W3D
WW3D_FORMAT_DX1 refers to the type of dds file, maybe the one you're trying to use is not supported by C&C - if you're using Photoshop you can select which one you wanna use as export.

I have found the custom textures that are generating the error, if someone could tell me what's wrong with them and how to fix them it would be most appreciated!
http://mediafire.com 

EDIT~~
turns out, it just didn't like the fact the fact that those files were .DDS, so after changing them to .tga, everything worked again.