Perfect, thanks! This message is telling you that you changed the data type of one of the promoted fields. Was that intentional? If not, change it back. :) If so, in design mode, under the File menu in the ribbon, on the Info category, select "Advanced Form Options". Navigate to promoted properties. Remove the promoted property named in the warning. Re-add it if desired. Then you should be able to republish. Changing a data type may have a bad impact on the already filled out forms, however... just something to be aware of.
Hilary Stoupa
