Error when using Timez Attack software

Hi,
We installed Timez Attack for our child in his PC and it was doing fine. However, suddenly, an error message appeared (see screenshot below) and Timez Attack wouldn’t work properly. We just recently installed an antivirus and we thought that it might be the cause but we couldn’t remove the antivirus software fearing the PC might get infected. There were other messages the popped up but we didn’t know what to do. Please help!

Error
There has been an error.
Error running C:TimezAttack.app/TimezAttack.exe : child killed: SIGABRT.
The application will exit now.
