why Input layers do not have the same grid extent in the processing, hydrological analysis?

I'm trying to generate the hydrological analysis using processing and I have already done some terrain processing using the DEM.

In this moment, I'm working in he channel network but, when i assign in the Elevation: the DEM and in the Initiation Grid: the Catchment Area the program gives me error:

thank you for entertaining my query. here is the screen shots of what has been generated

thank you for your help