Perspective "Sessions Exceeded" in Edge 8.0.12 with only one open session

Hi
After I install ignition edge 8.0.12 I try to open a perspective session but get following error:

The number of running client sessions has exceeded the permitted number.

Of course this is the first perspective session and I don’t open any other sessions or even vision client or designer at the same time.
So I wonder why I get this error.

Did you change the default visualization mode? Edge can only use one visualization module at a time (either Vision or Perspective). See more about this here:

https://docs.inductiveautomation.com/display/DOC80/Edge+Panel#EdgePanel-VisualizationMode

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