Strange SIBABRT error

I started receiving the below error when attempting to run an application I was developing on iPhone:

Couldn't register *your app details* with the bootstrap server. Error: unknown error code. This generally means that another instance of this process was already running or is hung in the debugger.Program received signal: “SIGABRT”.

I tried a lot of things to solve this before stumbling onto the solution (in this case) of restarting the iPhone.

What do you think? Let me know by getting in touch on Twitter - @wibosco