HEC-GeoRAS error

[alfarooq74]

Hi

I m a new to HEC-GeoRAS. I m using HEC RAS in my thesis. When I run RASGeometry>stream centerlin>from station to staion

Then I get this error

calclength station wk:20001 more than one up strean feature with same river ID.

However when I check the table there is no such things.

Also If run the other menu for data extraction from TIN I got error with 20003...
Please help me if some body know.

Regards