There is an error in your dialplan, probably a variable that has not been set. You are trying to do Dial(), or Dial(/123456789), which obviously won’t work and would have been obvious if you had used the advice to set verbosity at least 5 when asking for support or reporting a bug.
The line itself is not the cause of the issue, it merely indicates what it is. Asterisk has been told to dial something without being provided a valid dial string. It’s up to FreePBX to provide that string so you would probably have better luck on their forums.
Thanks @jcolp Sometimes it’s hard to figure out if its Asterisk/FreePBX that is the “culprit”, especially since we have a lot of custom code.
I understood the context of the fact that having empty ‘’ was not the “cause”, but really the issue itself was that i was being presented with an empty string. Thank you for clarifying just in case though.