sincroguia.tv (Spain) NOT working

Hi! Both sincroguia.tv and sincroguia.tv.mp are not longer working. This is what I get, for example, with this TV channel (site_id=920):

Unable to update channel DARK
Generic syntax exception:
   message:
no index page data received from DARK
unable to update channel, try again later

However, the TV listings are showing in the website:

https://sincroguia.tv/programacion/dark

Has anyone any idea of how to solve this problem?

Thanks in advance.