WARNING: No variables specified for an SSCP matrix. Execution terminating.

[robinsas]

Hi I keep getting this error, the code I provided was a proc reg statemenmt to look at vif values

proc reg data= REGCLASS.BODYFAT;
Model PctBodyFat2 = Weight Adioposity Neck Chest Abdomen Hip Thigh Knee Biceps/ vif toi;
Run;

[stat_sas]

What type of variables are you using as predictiors, continuous or character variables?