Securing my APP - Academy Rapid Developer 9.3.3

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Hi, I am busy with learning in Academy in Rapid Developer Module 9.3.3. I have a problem. When I try to set up an entity access for the Entity ”Teacher” I am getting Error message. I am sending a photo. I tried with downloading the APP directly from Mendix (because I thought that I made a mistake somewhere), but it is the same. Thank you in advance.  
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I think this forum post already gives the right answer: https://community.mendix.com/link/questions/109675

Regards,

Ronald

 

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