EAP-TLS error message on ACS server

Receving this message when client attempts authentication....Any idea or pointers on troubleshooting this?
"EAP-TLS authentication failed during handshake"

turn on debugging at the AccessPoint (:eap_diag1_on at 350-Series) or at the ACS (csradius -d -p -z) to get more information
http://www.cisco.com/en/US/products/sw/secursw/ps2086/products_tech_note09186a00800afec1.shtml
Verify Certificates and CA at the client and the ACS
http://www.cisco.com/en/US/products/hw/wireless/ps458/products_white_paper09186a008009256b.shtml

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    2134: portable-9b7161: oct 28 2010 20:34:29.171 -0100: %CSSC-7-DEBUG_MSG: %[tid=2044]: {764C6E35-2FFF-47CF-A0CA-5B90E9483367}: Credential Request completed, response sent : sync=9
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    2136: portable-9b7161: oct 28 2010 20:34:29.171 -0100: %CSSC-7-DEBUG_MSG: %[tid=344]: Calling acCredDeferred
    2137: portable-9b7161: oct 28 2010 20:34:29.171 -0100: %CSSC-7-DEBUG_MSG: %[tid=344]: {764C6E35-2FFF-47CF-A0CA-5B90E9483367}: Credential Request deferred : sync=10
    2138: portable-9b7161: oct 28 2010 20:34:29.171 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: Impersonating user
    2139: portable-9b7161: oct 28 2010 20:34:29.171 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: Loading client certificate private key...
    2140: portable-9b7161: oct 28 2010 20:34:29.171 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: Calling acCertLoadPrivateKey()...
    2141: portable-9b7161: oct 28 2010 20:34:29.187 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: ...acCertLoadPrivateKey() returned
    2142: portable-9b7161: oct 28 2010 20:34:29.187 -0100: %CSSC-3-ERROR_MSG: %[tid=140]: Internal error 204, contact software manufacturer
    2143: portable-9b7161: oct 28 2010 20:34:29.187 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: acCertLoadPrivateKey() error -20 [c:\acebuild\bldrobot_cssc_5.1.1.21_view\monadnock\src\ace\certificate\certificateimpl.cpp:239]
    2144: portable-9b7161: oct 28 2010 20:34:29.187 -0100: %CSSC-3-ERROR_MSG: %[tid=140]: Internal error 4, contact software manufacturer
    2145: portable-9b7161: oct 28 2010 20:34:29.187 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: CssException for function 'acCertLoadPrivateKey' => -20{error} [certificateimpl.cpp:240]
    2146: portable-9b7161: oct 28 2010 20:34:29.187 -0100: %CSSC-3-ERROR_MSG: %[tid=140]: Internal error 7, contact software manufacturer
    2147: portable-9b7161: oct 28 2010 20:34:29.187 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: Assertion 'CSS exception - should this be logged instead?' failed at [cssexception.cpp:114]
    2148: portable-9b7161: oct 28 2010 20:34:29.218 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: Client certificate private key has not been loaded
    2149: portable-9b7161: oct 28 2010 20:34:29.218 -0100: %CSSC-7-DEBUG_MSG: %[tid=140]: Deimpersonating user
    2150: portable-9b7161: oct 28 2010 20:34:29.218 -0100: %CSSC-7-DEBUG_MSG: %[tid=2044]: Client certificate 239f43fdcde8e190540fab2416253c5660c0d959 has been processed: ERR_INTERNAL_ERROR(7)
    2151: portable-9b7161: oct 28 2010 20:34:29.218 -0100: %CSSC-7-DEBUG_MSG: %[tid=2044]: Certificate 239f43fdcde8e190540fab2416253c5660c0d959 is unusable
    2152: portable-9b7161: oct 28 2010 20:34:29.218 -0100: %CSSC-7-DEBUG_MSG: %[tid=2044]: {764C6E35-2FFF-47CF-A0CA-5B90E9483367}: Credential Request completed, no response sent : sync=10
    2153: portable-9b7161: oct 28 2010 20:34:30.078 -0100: %CSSC-7-DEBUG_MSG: %[tid=2044]: Checking for new configuration
    2154: portable-9b7161: oct 28 2010 20:34:32.078 -0100: %CSSC-7-DEBUG_MSG: %[tid=2044]: Checking for new configuration
    2155: portable-9b7161: oct 28 2010 20:34:34.078 -0100: %CSSC-7-DEBUG_MSG: %[tid=2044]: Checking for new configuration
    It seems that It found a valid certificate, starts the Authentication proccess and when it must request the ACS challenge it fails when loading the private key and crash the supplicant 
    Do you think the same??
    Thanks.
    Best Regards.

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