i am getting the same error on a lot of channels using tvtv.ca
Same error if i use gracenote.com as well
https://www.tvtv.ca/bc/burnaby/v5h2k3/luCAN-0009972-X/stn/112291
Debug ]
[ Info ] ( 6/158 ) TVTV.CA -- chan. (xmltv_id=1503 - TLNFL3) -- mode Incremental
[Warning ] server error, code 500
[Error ] Unable to update channel 1503 - TLNFL3
[Critical] Generic syntax exception:
[Critical] message:
[Error ] no index page data received from 1503 - TLNFL3
[Error ] unable to update channel, try again later
[ Info ] Existing guide data restored!
update. i just ran it again. sometimes they work sometimes not.
i
error downloading page: Response status code does not indicate success: 429 (Too Many Requests).
Unable to update channel HDS17(460)
Generic syntax exception:
message:
no index page data received from HDS17(460)
unable to update channel, try again later
Existing guide data restored!

429 (Too Many Requests).
it explains itself.
your grabbing data too fast and the site is blocking you.
slow down grabbing increasing the delays in the ini file on the site {xxx} line.
increase the show-delay first by 1,if you still get blocked raise it again.
i wouldnt go any higher than 3
after that increase the index-delay by one,until u get to 3.
if still blocked only one left is channel-delay,do the same thing.
its usually the show-delay that triggers the block.
ok thanks i put this under site line.
site {retry=<retry channel-delay="0" index-delay="1" show-delay="2" time-out="30">4</retry>}