I use SAS University edition to analyze my data. While using SAS PLM Procedure, it give a warning message: WARNING: Unable to retrieve model information from item store WORK.PROGRAM1 with a note of NOTE: The above message was for the following BY group:        depth=40-60 and does not show results for one of my groups (depth). However, it shows results for other three groups of my data. How can this problem be solved? I have pasted the codes that I have used. Thank you in advance.   proc sort data=WORK.IMPORT; by depth year; ods output type3=aov3; proc mixed data=WORK.IMPORT method=type3; by depth; class year trt rep; model avln = rep trt year trt*year /ddfm=satterth; random rep*trt rep*year; store Program1; run; proc print data = aov3; run; proc plm source=Program1; lsmeans trt year trt*year /diff lines; * adjust=tukey; run; ... View more