New CMSComponent - Error with some users

[Former Member]

We have made a new CMSComponent extending SimpleCMSComponent and have made an update to the Hybris system. Some users get an error while trying to open the "Components" page in Backoffice WCMS and CMSCockpit content pages. Error is "No composed type [NEW COMPONENT] exists". Some users including me and another user made with the same restrictions and personalizations do not get this error and can create new components just fine. On my computer I can use problematic user's account and access the new component although they cannot on their own computer.

Would you have any suggestions where to look into trying to find the problem?