Templates not showing up

When i set dom0 update proxy to sys-whonix in Qubes OS Global Config, templates from qubes template manager dont show up(any of them, the list is empty even after i hit refresh button). I have tor connection, since i am writing this from anon-whonix tor browser

It can take a while to update the list of templates in Template Manager when updating over Tor. Leave the window opened for a while for a test (a few minutes or maybe an hour).

I failed to see the error, here it is:
Failed to fetch template list:
[Qrexec] gntshr: error: ioctl failed: No space left on device
Thats werid, because i have like 2 TB free on my two ssds combined. How can i fix this?

Check the disk usage in the output of df -h command in dom0 terminal.