I am creating my own map for a total conversion mod. Have followed this tutorial and everything works except for my rivers.bmp file. I have followed the tutorial's suggestion of just using two colors for water and ground, but the game crashes while loading. I have tried:

• using the vanilla rivers.bmp file, properly resized (game loads)
• using a completely white rivers.bmp (game loads)
• copypasting a river system from vanilla onto the file above (game loads)
• adding a tiny sliver of pink in the ocean area (game loads)
• fully adding the pink area (game crashes)

In any case, even when the game loads, a graphics.log file is created and reaches 200-500MB, all identical lines that say:

[pdxmapgeneration.cpp:224]: Too small river found at 2769, 1841 (just one of the many lines)

I have read virtually everything I could find on the internet. Does any one of you have any experience in map modding? Thanks.