I tried doing it via the first method you mentioned (http://tutorial-iptv-xbmc.blogspot.co.uk/2014/12/setup-live-tv-pvr-iptv-simple-client.html) and while no errors occur, there is no Live TV menu option after restarting Kodi (as suggested within that tutorial). I re-checked the configuration settings for this add-on and all appear OK (as in the tutorial).
You didn't confirm how you specifically installed this add-on and as such I can't compare. It looks to me you did it differently than what you suggest given the errors you received.
I pointed out those two methods just be cause this add-on is not pr-installed in 1.0.7 KODI like it is in official version(tutorial).
and like it was in previous version of firmware.
I was trying both methods so i can get back live-TV menu on my box.
First method does not give me any error during installation but Add-on is not enabled - maybe some libraries are missing ?
Then after uninstalling add-on i have try second method , and then I have errors .
Never the less I'm not able to get this add-on working,while had this installed before upgrading to 1.0.7 and it disappeared after.
In general if add-on is installed correctly and enabled , in SYSTEM Live TV and after restarting KODI new menu (TV) will appear in Home screen.