I was trying to open the custom confirmation dialog box it was not showing in the page. when I refresh the entire application in browser or else try to logout at that time it was showing the popup.

In console I was seeing this logs. when I refresh the entire application from the page it was showing the popup. Below are the errors I was getting in console

push../node_modules/@ng-bootstrap/ng-bootstrap/fesm5/ng-bootstrap.js.NgbModalStack.open push../node_modules/@ng-bootstrap/ng-bootstrap/fesm5/ng-bootstrap.js.NgbModal.open push../src/app/confimation-dialog/confirmation-dialog.service.ts.ConfirmationDialogService.confirm