No configuration on devices after re-opening the eNSP file

Hello everyone,

This post is about the issue of no configuration on devices after re-opening the eNSP file.

I have designed my topology, done the configuration, and run the devices. It works well. 

I save my topology and close eNSP. After re-opening the same file, there is no configuration on the devices. This happens every time. What is the cause and what is solution?

Please help me! Thank you!