Same error appears when I try to diconnect it. My broadband is ZTE Airtel 4G.
There could many causes to this issue:
The application was corrupted making it impossible to start again. A simple reinstall of the software should fix the problem.
The computer is infected with virus or malware applications. Periodic check is recommended (antivirus examples)
Compatibility with the installed operating system. Right click the main executable and change its compatibility mode from Properties > Compatibility.