Manning n values extraction in hec geo ras

[Environgis]

I am extracting manning n values in hec georas from landuse shapefile and it gives the message that N values are extracted successfully but the resulting manning table is empty with only header of ObjectID, XS2DID, Fraction and N_values with empty columns and rows.

[DanPatterson_Retired]

outside of the normal realm of the type of questions... but what have you seen from these links

https://www.google.ca/search?q=mannings+n+hecgoras&ie=&oe=