Issue
When attempting to open a Control Expert project that contains a safety controller the above error is presented.
Resolution
This means that the safety add-on needs to be added to your install of Control Expert.
The licenses can be purchased online. Below is a link to the single addon for an XL license, if your Control Expert is Group,Team,Entity or Float just search the correct license number on se.com and order.
You can determine which license it is that you have activated by launching the License Manager.
Here are the part numbers: