Error in using UHARD

[Moosa.B.Owsia]

Hello,
I wanna use UHARD (a simple subroutine) in ABAQUS, but I faced with this error:

"User subroutine umat will be used with the stavev array dimensioned to zero since the *depvar option is not used with this material. Consequently, defining statev entries in subroutine umat will cause code execution errors."

I dont know how can I solve it.
I used UHARD but it said UMAT, I don't know why!

Is there anybody to help me?

Thanks in advance
Moosa