Crashing on "rojo serve"

[phoriah]

Freshly Installed & Rebooted. Nothing helped.

PS C:\X\workspace\Y\Z> rojo serve

Rojo server listening:
  Address: localhost
  Port:    34872

Visit http://localhost:34872/ in your browser for more information.
[ERROR rojo] Rojo crashed!
[ERROR rojo] This is probably a Rojo bug.
[ERROR rojo]
[ERROR rojo] Please consider filing an issue: https://github.com/rojo-rbx/rojo/issues
[ERROR rojo]
[ERROR rojo] Details: error binding to 127.0.0.1:34872: error creating server listener: Only one usage of each socket address (protocol/network address/port) is normally permitted. (os error 10048)       
[ERROR rojo] in file C:\Users\runneradmin\.cargo\registry\src\github.com-1ecc6299db9ec823\hyper-0.14.26\src\server\server.rs on line 79
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace.

[Dekkonot]

Can you confirm that nothing else is bound to that port?

[phoriah]

Yes, I've also tried 34873

Can you confirm that nothing else is bound to that port?