Abaqus UEL error

***WARNING: USER SUBROUTINE UEL WILL BE USED WITH THE STAVEV ARRAY DIMENSIONED
             TO ONE SINCE THE VARIABLE PARAMETER HAS NOT BEEN SPECIFIED.
             CONSEQUENTLY, DEFINING MORE THAN ONE STATEV ENTRY IN SUBROUTINE
             UEL WILL CAUSE CODE EXECUTION ERRORS.

Can somebody help me out with this error?

I am new to abaqus subroutine writing, getting familiar with interface and input file. I am trying to make a UEL subroutine for simple 4 node, quad, linear elastic plain strain element. When I ran subroutine with input file created for 1 element, I am getting this warning .

Thanking you all experts in Abaqus in advance.