Adding a esx 5.5 host to a 5.0 cluster

I'm have a ESX 5.0 cluster running with vCenter.  I'm trying to add a 5.5 host to the datacentre, not cluster.  However I get the follow message

A general system error occurred:  Timed waiting for vpxa to start

There was some license alert when trying to add about features not working with this version.  Should this work or do I have to upgrade the 5.0 version first?
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wannabecraigAsked:
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AbhilashBloggerCommented:
What version is your vCenter?
Only vcenter 5.5 can manage ESXi 5.5. vCenter 5.0 will not be able to manage 5.5 ESXi host.

You will have to either upgrade the vCenter to 5.5 or downgrade the host to 5.0.

If the version compatibilty is taken care of then you can take a look at this KB Article
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2009217
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wannabecraigAuthor Commented:
It's vCenter v 5.0.  If I upgrade this will I still be able to manage the 5.0 version of ESX that's on the existing hosts?
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AbhilashBloggerCommented:
Yes. If you upgrade your vCenter you will still be able to manage 5.0 hosts.

Whenever you have any doubt regarding interoperability of Vmware products you can check it in VMware Product interoperability matrix
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