Need a Google Voice app for Mac Background
I've been using Google Voice for about a year. During that time, I've been also using a Mac app called GrowlVoice that appears in my menubar. It allows listening to voicemail messages and also sending text messages.
Error
Now when I launch Google Voice I get an error:

Unable to sign in to myemailadress@gmail.com
Unable to build JSON object from JSON string&quot;

What I tried
I deleted GrowlVoice's app using an CleanMyMac, an app that supposedly deletes apps and all their associated files. I then re-downloaded GrowlVoice from the App Store, but I'm still getting the error.
Further Research
I also went to the website of the GrowlVoice developer and sent him a message. I'm writing here too because the developer's site hasn't been updated since 2012 and GrowlVoice is no longer being sold on the App Store so it's apparently no longer in development.
Questions
So, my questions are:

How can I fix the JSON errors?
Is there another app that would have similar functionality as GrowlVoice?

Update
Apparently today Google made changes to Google Voice which broke GrowlVoice, which is why GrowlVoice was pulled from the Mac App store. Now I have to log into my Google account in a browser if I want to listen to voicemail messages or send texts on my Mac.
The developer's twitter page said that Google has revoked access to Google Voice for GrowlVoice so they can no longer support the app.  It has since been removed from the App Store as well and I am also looking for an alternative to this wonderful application.