HybernetTestApp.User.hbm.xml(3,2): XML validation error: 
The 'urn:nhibernate-mapping-2.2:hibernet-mapping' element is not 
declared.


this error apears that 'urn:nhibernate-mapping-2.2:hibernet-mapping'
element is not declared.

hmm

it does not exists this line should be 

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.0"
assembly="assemblyName">

(or for version 1.2.1

<hibernate-mapping xmlns="urn:nhibernate-mapping-2.2"
assembly="assemblyName">


(i can't see others place that maybe incorrect sintax, u should look
with more attention!)

good luck!