I had the same problem a cuple of days ago, and this is what I did to resolve it.
1 uninstall dialcentral
2 erase all you have in /home/user/.dialcentral
3 download and install dialcentral 1.0.4-5
4 star dialcentral and input login settings (remember select google voice)
5 once you have dialcentral 1.0.4-5 running with no error, run in terminal sudo apt-get update, sudo apt-get upgrade. This will upgrade dialcentral to the latest.

I hope this help

Ed