PVR WMC - add-on couldn't be loaded

After a new install of OSMC on my Raspi2 I did not have TV on my main menu. So I was going to uninstall and then re-install PVR WMC. I found that PVR WMC was installed but disabled. After clicking the ENABLE icon I got the message: Add-on couldn’t be loaded. An unknown error has occurred. I can’t uninstall because the uninstall icon is grayed out.

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