GET request on Internal loop back results 500 Internal server Error

Test Steps:

GET request
http://localhost:8080/restconf/config/opendaylight-inventory:nodes/node/<controller-config>/yang-ext:mount/

Response:
500 Internal Server Error

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<errors
xmlns="urn:ietf:params:xml:ns:yang:ietf-restconf">
<error>
<error-type>application</error-type>
<error-tag>operation-failed</error-tag>
<error-message>Problem to get data from transaction.</error-message>
</error>
</errors>

Env:
org.opendaylight.controller.version = 0.1
org.opendaylight.controller.build.scm.version = 8b4d61d841649cd054bb62b20fcc64e87cc7c36d
org.opendaylight.controller.build.user = jenkins-controller
org.opendaylight.controller.build.workspace = **********
org.opendaylight.controller.build.timestamp = 1409854132914
org.opendaylight.controller.build.machine = **********
[odl@pce-guest33 opendaylight]$