Your insider program settings are corrupted.
You can fix this by deleting WindowsSelfHost -key from registry.
- Open open regedit (push Win key and type regedit).
- Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsSelfHost
- On left panel right click that key and delete it.
- Close regedit and restart.
- After restart check insider program settings, relik to program is required and select proper insider channel.