Open Stack

hello there,i setup using devstack ..below is my docker version output
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redhat at test:~/devstack$ docker version
Client version: 0.7.6
Go version (client): go1.2
Git commit (client): bc3b2ec
Server version: 0.7.6
Git commit (server): bc3b2ec
Go version (server): go1.2
Last stable version: 0.9.0, please update docker
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I followed a guide from
*http://damithakumarage.wordpress.com/2014/01/31/how-to-setup-openstack-havana-with-docker-driver/*

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I tagged an image using 

$ docker tag urgensherpa/lamp6 192.168.140.193:5042/lamp6
Below is my 'docker push' commad output.

redhat at test:~/devstack$ docker push 192.168.140.193:5042/lamp6

The push refers to a repository [192.168.140.193:5042/lamp6] (len: 1)
Sending image list
Pushing repository 192.168.140.193:5042/lamp6 (1 tags)
2014/03/11 13:22:03 HTTP code 500 while uploading metadata: invalid
character ‘<' looking for beginning of value
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Please let me know what i need to do thanks 



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