How about a bit more information?
Versions of coherently mods, your Script file oh and minetweaker has a own log file, you don't have Screenshot the error messages.

Railcraft_1.7.10-9.7.0.0, ModTweaker2-0.9.3/

Script:
mods.railcraft.BlastFurnace.removeFuel(<minecraft:coal:1>);

Please post your error in #193.