Testing for heteroscedasticity

Question

I try to run white test in sas and it return this error message to me.

ERROR: There is no model program. Cannot perform requested tasks

What is the problem?

Following is the code I use:

proc model data=all;
  fit y / white pagan=(1  x1 x2 x3)
  out=resid1 outresid;
run;
quit;