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http://uesp.net/wiki/Skyrim:Message_to_Whiterun_%28Stormcloaks%29
Sounds like you're at stage 225, so in theory "setstage CW03 240" or "setstage CW03 255" should advance it further (without quotation marks). No guarantees though. You can find out the exact quest stage with "getstage CW03".
The error message is weird, if you haven't made a typing error, I can only imagine it's because Civil War overhaul changed the quest references or sth.
As such the next quest, battle for whiterun doesn't start (CWSiegeObj) and cannot be started manually.