I totally concur with @PaigeMiller 's suggestion to post the log using the "Insert Code" icon.    Meanwhile, two comments:   1. Although the GLM procedure allows multiple dependent variables in its MODEL statement, you can name only one dependent variable in the MODEL statement in the MIXED procedure. I'm pretty sure this is the source of your error, but it is not your only problem.   2. In the GLM procedure both fixed and random effects variables are specified in the MODEL statement. (However, you should never use GLM for mixed models.) In contrast, in the MIXED procedure, fixed effects variables are specified in the MODEL statement, and random effects variables are specified in the RANDOM and/or REPEATED statements. You'll want to learn more about fitting mixed models using MIXED and then revise your MODEL and RANDOM statements. For more information, see   Introduction to Mixed Modeling Procedures   SAS® for Mixed Models: Introduction and Basic Applications   ... View more