tried running as admin but no luck. I've noticed that the issue happens when adding the .tga files (which are the normal maps of the .dds textures). Without them it works fine. I tried to put them as png instead of tga but i get the same error. Not sure if it could be related to having a limit of number of textures that wed can handle.
3D Gamestudio A8 Pro AMD FX 8350 4.00 Ghz 16GB RAM Gigabyte GeForce GTX 960 4GB