Error: Something went wrong. Unit was not saved!

Have a similar issue to another forum user who stated:

"Hi can you help me. I have a fresh installed wp4.7 with the latest version of Coursepress Pro. But it seems i can't save a unit."

You provided a fix and I am hoping you can assist. My conditions are the same as his. Fresh install and up-to-date with plugin and WP Version.

Thanks!