Not able to push custom package in satellite 5.x Error: 500 Internal Server Error

Issue

• Getting below error while pushing custom package using rhnpush command.

# rhnpush --nosig --force -v -c channel-name --server http://localhost/APP testpackage.rpm
Connecting to http://localhost/APP
Package testpackage.rpm Not Found on RHN Server -- Uploading
Uploading testpackage.noarch.rpm
Using POST request
Internal server error 500 Internal Server Error
Error pushing testpackage.noarch.rpm:  (500)
Waiting 5 seconds and trying again...
Uploading testpackage.noarch.rpm
Using POST request
Internal server error 500 Internal Server Error
Error pushing testpackage.noarch.rpm:  (500)
Waiting 2 seconds and trying again...
Uploading testpackage.noarch.rpm
Using POST request
Internal server error 500 Internal Server Error
Error pushing testpackage.noarch.rpm:  (500)
Waiting 1 seconds and trying again...
Giving up after 3 attempts