argument 'Expression' is not valid

[young]

Hello. I am beginer for arcswat. I constructed dataset, and then try
to run arcswat. my watershed is international. So, I overwrote my
usersoil.dbf into Arcswat database. in write input table, I got a
message (Argument 'Expression' is not a valid value'). I donot
understand what is wrong. I need your help. please comment for me.
Thank you.

[Naresh]

Young,
Sounds like your soil layer has not been integrated with the
model properly. What version of SWAT are you using ? Make sure in the
lookup table for soil you did not have repeat soil names. Also, make
sure all soils in your lookup table are present in usersoil.dbf.

Naresh