[讨论]在modelsim5.8 中遇到的问题

fanqiongjian

我在使用所提供的dff测试程序仿真时，怎么出现下面问题，难道是版本问题吗？我使用的是lattice isplever modelsim5.8，怎么解决这个问题啊
vsim work.dff
# vsim work.dff
# Licensing checkout error with feature vantmti. (Error code -21.)
# The *** file does not support this version.
# The most common cause of this error is that the ***
# file maintenance date has expired.  The maintenance date
# specifies which version of a product you can run.
# You can run versions that were released prior to your
# maintenance expiration date, but attempting to run versions
# released after your maintenance expiration date will produce
# this error.
# (Example: If the *** file maintenance date is 2000.050
# you can run only versions released during or prior to May, 2000.).
# ** Error: Failure to obtain a Verilog simulation *** .
# Error loading design