** ERROR WHILE CHECKING INPUT SPECIFICATIONS FOR VARIED VARIABLE IN
SENSITIVITY BLOCK: "S-1"
THIS VARIABLE IS NOT SPECIFIED IN THE BLOCK.
YOU CAN PROVIDE AN INITIAL ESTIMATE IN THE BLOCK
OR VARY ANOTHER VARIABLE.
VARY SENTENCE NUMBER 1
! Errors while processing input specifications
这是我进行灵敏度分析确定回流比,怎么总是出现这种问题?