proc sort data=sasuser.qiang_pom2;
by hotel_id customer_id;
run;

运行出错：
ERROR: SAS Syntax Editor control is not installed.
ERROR: SAS Syntax Editor control is not installed.
1    proc sort data=sasuser.qiang_pom2;
2    by hotel_id customer_id;
ERROR: Variable HOTEL_ID not found.
ERROR: Variable CUSTOMER_ID not found.
3    run;



怎么才能运行它