Hi Santosh,
Most of these error were sorted in variety of notes. Have a check to ensure that you are on the latest solution versions. Refer to attached document and check Group C
SAP Fiori - Add-on quick reference for transactional apps
I am sure you have already referred but have a read again.
SAP Fiori UX - Installation for Transactional Apps
If you fail to find the issue, then Share your system component version, any logs you can find. If this error occurs at Quick Entry, then try to make simple day entry and see if you can make entries.
Regards,
Sudhir