Issues in hiring an empoyee(form is not working properly)

Dear all,

I got an interesting error.

I tried to hire a new worker in payroll module. But when I click on "hire new worker". The button is not getting called. So I clicked on personalize. It showed only one button in Button group

But at form level I have 2 buttons in button group.

Though all the properties are correct why this form is not working properly(Note:this is client location where we imported some of the XPOs. Compilation, CIL also done)

Please help me out in finding the solution........