"Transfer Aborted: instance not found" won't let me zone in over and over again

[Sergio 1]

Why do I keep getting this every time I tried to zone in queued dungeon? Every time I tried, the loading screen did nothing at all, then "Transfer Aborted: instance not found" error message appear. Then I tried again, same result. I'm sick of this stupid error, to the point where it kept me from queuing dungeons every 13-15 min. I even tried relog and disable all addons to no avail. WHAT THE HELL IS HAPPENING HERE?!?!?!