State tax filing

Having the same problem with filing my MO state tax return.  Did efile for federal and it was rejected.  Made the changes and it was accepted.  Over 2 weeks have elapsed, and I still am unable to efile my state taxes because it says that the federal has to be efile and it was already accepted.  How do we resolve this.  At this point, if I could I would just mail it in.  Need to resolve.