请教大家啦：
我用一下方法导入数据，但是得到下面语句：
6    libname aa'F:\2008.xls';
ERROR: The product with which the engine EXCEL is associated is either not licensed for your system
       or the product license has expired. Please contact your SAS installation representative.
ERROR: Error in the LIBNAME statement.
7    data a;
8    set aa.'sheet1$'n;
ERROR: Libname BS is not assigned.
9    run;
这是不是说明我的license有问题啊？ 万分感激。