A Problem when using PrimeTimePX

When I use the "read_vcd" command to load the vcd files to access power consumption, A license problem occurs as following:
Error: This site is not licensed for 'PrimeTime-PX'. (SEC-51)
Error: Cannot proceed without power analysis feature. (PWR-002)
Does anyone provide me some advice to settle this problem down, I'll appreciate that.

check you license setting
or buy the license

你license有问题。

looklook