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Does the Error 500 occur on the welcome page? or after you've clicked on of those command buttons?

Lets see the piece of code which returns the outcome "admin" and "admintest"?

<from-outcome>admintest</from-outcome>
<to-view-id>/pages/dashboard.xhtml</to-view-id>
<redirect />


Try replacing that 'pages' to test

Have you got a faces-config file?