ERROR: File _IMEX_.RiskFreeRateByMonth.DATA does not exist.
ERROR: Unable to clear or re-assign the library _IMEX_ because it is still in use.
ERROR: Error in the LIBNAME statement.
ERROR: Import unsuccessful.  See SAS Log for details.
NOTE: The SAS System stopped processing this step because of errors.
NOTE: PROCEDURE IMPORT used (Total process time):
      real time           0.58 seconds
      cpu time            0.40 seconds

126  Proc print data=_last_(obs=10);title "Risk free rate ";
ERROR: File WORK.RISKFREERATE.DATA does not exist.

数据名称与sheet名字都是存在且正确的。