I agree with @DanH_sas . Check your product license/install with:
proc product_status; run;
And see if SAS/GRAPH is detected.
You can create histograms with PROC UNIVARIATE and other SAS procedures using ODS GRAPHICS, and that does not require SAS/GRAPH.
ods graphics on; Proc univariate data = test; Var variable1; Histogram; run;
Here is the correct syntax for your program:
Proc univariate data = test; Var variable1; Histogram; run;
Note you don't use equals signs in the VAR statement. Now run this program and check your SAS log. Is it error-free? Check for any output. If you are getting text output but not graphic output it is possible that your ODS settings are not correct. Try adding this to your program:
ods HTML; Proc univariate data = test; Var variable1; Histogram; run;
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