Hi Veronika,
Great that you found the solution to the problem. We mention EyeX Engine compatibility in the readme file of each package, e.g. “This version of the EyeX SDK requires EyeX Engine version 0.8.14 or later.”, but we should probably be even more clear to avoid misunderstandings.
Note that the EyeX Engine and SDK are still under heavy development, and new releases will continue to be available through the auto-update function in the EyeX settings panel. We expect at least one more API change that will require EyeX SDK developers to adjust their code a bit. We’ll do our best to communicate when this will happen through as many channels as possible.