紧急求助，关于ANSYS 安装的问题！

我安装的ANSYS在运行时，总是运行不了，出现以下问题
prproduct: ansys multiphysics(feature"ane3f1").
checkout failed for the above product.
FLEXLm error message:
system clock has been set back (-88,309)
seservers/license files searched:
1055@ch
(for additionaol licensing debug details,set the ANS_FLEXLM_DEBIG emvorpm,emt varoable
to "1" before running this product. For maximum licensing debug debug details,set this
en emvironment varoable to "2".)
求求个位高手给于指点，不胜感激！（最近几天为这食不知味，也不能寐，郁闷非常！）