I have some problem using CREO simulate

Hello. I am using Creo 3.0 Student Version. But I have some problems to simulate thermal mode and structure mode.

First, when I attempt to run the Creo simulate, I face on the message "License error".

Second, my laboratory has some creo 3.0 education license. So, I sometimes use that to simulate thermal mode and structure mode. But, I meet with a difficulty with this message

"The model is insufficiently constrained for the analysis. Please review the element connections, properties, and constraints in highlighted entities. If this is a modal analysis, then you may be able to obtain a solution by requesting additional modes.".

How can I solve problems?

Thanks in advance to your help.