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Error "getDRMAdditionalHeader failed." of PHDS in AMS5.0.5

Update:12-10Source: network consolidation
Hi, I am trying to update AMS version from 5.0.3 to 5.0.5.
But I could not get manifest file(f4m) of PHDS VoD for "Internal Server Error."
Please Help me to PHDS config for AMS 5.0.5.
Host OS :  CentOS 5.8 and 6.3 64bit.
# tar zxvf AdobeMediaServer5_x64.tar.gz
# cd AMS_5_0_3_r3029 or AMS_5_0_5_r5012
# ./installAMS
(default install settings and install license file)
# cd (ams install dir)/ams/Apache2.2/conf
# vi httpd.conf
< #   EncryptionScope server
< #   ProtectionScheme phds
>    EncryptionScope server
>    ProtectionScheme phds
# /etc/init.d/ams start
# cp (src content file) (ams install dir)/ams/webroot/vod/test.mp4
In AMS 5.0.3:
# curl
<?xml version="1.0" encoding="UTF-8"?>
<manifest xmlns="">
In AMS 5.0.5:
# curl
<title>500 Internal Server Error</title>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator,
  [no address given] and inform them of the time the error occurred,
and anything you might have done that may have
caused the error.</p>
<p>More information about this error may be available
in the server error log.</p>
<address>Apache/2.2.21 (Unix) DAV/2 Server at Port 80</address>
# cat (ams install dir)/ams/Apache2.2/logs/error_log
[Fri May 09 16:33:28 2014] [info] mod_unique_id: using ip addr X.X.X.X
[Fri May 09 16:33:29 2014] [notice] Digest: generating secret for digest authentication ...
[Fri May 09 16:33:29 2014] [notice] Digest: done
[Fri May 09 16:33:29 2014] [info] mod_unique_id: using ip addr X.X.X.X
[Fri May 09 16:33:30 2014] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations
[Fri May 09 16:33:30 2014] [info] Server built: Oct 19 2011 19:11:18
[Fri May 09 16:33:52 2014] [error] mod_jithttp [500]: [err=1] DRM configuration failed: getDRMAdditionalHeader failed. Error: DME Error

The Best Answer

Couple of questions,
Did you upgrade from 5.0.3 to 5.0.5 or is this a clean install?
Has 5.0.3 worked before on the same machine on which now 5.0.5 not working?