Teamviewer not running on partner computer

I'll keep this short. 

When trying to connect to my computer from another device, it will display the message "TeamViewer not running on partner computer."

I've had this problem for a while now, and it's quite inconvenient. I've tried rebooting my PC, reinstalling TeamViewer, using different devices. Even when I am on TeamViewer on my own PC it will display itself as offline.

 

Any help with this issue will be appreciated.