Cant get back into channel 1

[Conmac19]

I left channel 1. Cosmos wouldnt let me rejoin it. It would just pop up this error message. I tried uninstalling the UI. Now it says that channel 1 is an invalid channel when I try to join it. How do I solve this problem?

[Tuatara]

How are you trying to join it? I am guessing channel 1 is your General chat for the zone. You can try typing in "/join General /1" to get it back.