This issue is usually caused by insufficient administrator permissions when launching the application.
Please launch EasyPay using Run as Administrator.
Set EasyPay to Always Run as Administrator
To permanently resolve the issue, follow the steps below:
Right-click the Core.exe icon.
Select Properties.
Click the Compatibility tab.
Tick the option:
Run this program as an administrator
Click Apply.
Click OK.
You may now launch EasyPay normally and log in to the system.