Can't apply UI changes through 'UI Adapt' functionality

Hello Expert ,

When I get into UI adaptation mode of Fiori app ‘Goods Receipt for purchase order’ . I am able to make basic changes to Fiori apps but when I’m trying to apply those changes ; I'm getting below error and can't able to apply changes or exit from UI Adapt functionality.

Sorry, a technical error occurred. please retry later.

Reason : Internal server error.

when i am trying to Undo changes(Reset to Standard Version) ,

I'm getting below error.

Please help me to resolve this error. Thank you.