React native debugger won't listen to 8081 port, throws exception on execution

Hi, I just upgraded to v0.9.8, and I can't run the app - this is the error I get when I run the app:

And then when I run the simulator debugger-ui in chrome is opened but the rndebugger won't connect, stuck in "Waiting for React to connect".

I'm using macOS 10.14.

I tried the following:
Kill the process listens to 8081 port
Restart my computer and open rndebugger right away

Thanks in advance for this amazing tool :)