TUFLOW Message 2011
ERROR 2011 - Using Mat command when no materials file has been specified.
A .tgc materials command such as Set Mat ==, Read GIS Mat ==, Read RowCol Mat == or Read RowCol Grid == has been specified, but Read Materials File == in the .tcf file has not been specified. A materials file must be specified if .tgc Mat commands are used.
This ERROR was introduced in Build 2010-10-AC. Prior to Build 2010-10-AC, if no materials file was specified a default Manning's n value of 0.05 is used. The 2d_uvpt_check layer can be used to validate the Manning's n values assigned to the model after all inputs.
Check that your .tcf (not .tgc) file contains a Read Materials File == command.