Error while inputting customized channels shapefile

[Mahesh Tapas]

Hello everyone, 

Has anyone dealt with channel numbering conflicts causing anomalously high flows in lower-order streams?

During preliminary runs, we noticed unexpectedly high flow values in several lower-order stream channels. After digging into it, the issue traced back to a SWAT+ channel numbering conflict: (for a couple of) smaller tributary channels were being assigned the same numbers as their adjacent higher-order streams, so the model couldn't distinguish between them.

We've identified the problem and are working on a fix, we are again redelineating streams and channels with lower thresholds (generating denser channel network). We have exported the channel shapefile and altered it per real watershed conditions, but when re-importing it I am getting an invalid null-geometry error. Which seems like a GIS issue but I kept getting the similar error even after I performed fix-vector file operation, any clues?

Thanks!