We have a winui based Pro app hosted on a server with updated licenses and adequate maximum number of users. However, some of the users seem to have received the following error when they open the aimms pro app. I have noticed this error only with developer licenses in general. Could you advice on a possible cause so we could investigate further?
![](https://uploads-eu-west-1.insided.com/aimms-en/attachment/98849125-e0c1-41b1-96ac-b5aeca58be6d.png)
Best answer by Patrick
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