I got a similar error during a skirmish 1x1 map.
attached client.log and clientcrashlog
27.01. 05:24:21.288 AssetLoader.LoadTextureInternal: loading texture Maps\Yuri's Revenge\XDeadman.png failed! Message: This image format is not supported
27.01. 05:24:21.297 Error loading preview texture: This image format is not supported
27.01. 05:24:21.387 KABOOOOOOM!!! Info:
27.01. 05:24:21.393 Message: Exception has been thrown by the target of an invocation.
Thank for CNCnet, can you release older versions of this so we can play or turn off auto-updates maybe
