rhnpush fails with Internal error 500

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Getting "Internal Server Error 500" while trying to Upload a package using rhnpush in Redhat Satellite server.

Internal server error 500 Internal Server Error

Error pushing /customsw/ilmt-1-0.x86_64.rpm: !DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xml:lang="en" xmlns="http://www.w3.org/1999/xhtml" lang="en"><head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
    <title>Error</title>
    <link rel="shortcut icon" href="/img/favicon.ico">
    <link rel="stylesheet" href="/css/rhn-base.css" type="text/css">
  <script src="/javascript/prototype-1.6.0.js"></script>

I have checked below link
https://access.redhat.com/solutions/68969

/var/satellite has enough space, selinux is in permissive mode and also tried using --force to upload. It doesnt help.

OS version - Red Hat Enterprise Linux Server release 6.6

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