I tried the latest version of Lenvica HRMS -Lite .
I see the message "Close all open windows and try again" whenever I switch from a select few tabs(ex. default employer tab) to another tab.
For whatever the reason you have kept this message, it becomes annoying. It is like the UAC feature in Vista which keeps on prompting for the admin privileges whenever I try to open a program. The prompt message interferes the flow of work of whoever is using your application.
I am sure you can find another way to deal with this.