500 is a pretty basic broken install kinda message.  Check logs for exceptions.
St.Ack

On Mon, Jun 20, 2011 at 12:32 AM, abhay ratnaparkhi
<[email protected]> wrote:
> I am getting exception while scanning a table using HBase explorer UI.
>
> *Error 500:*
> *Servlet:* default
> *URI:* /hbaseexplorer-0.4.1/hbaseSource/index
> *Exception Message:* No signature of method: java.util.TreeMap$1.first() is
> applicable for argument types: () values: [] Possible solutions:
> print(java.io.PrintWriter), print(java.lang.Object), sort(),
> find(groovy.lang.Closure), sort(groovy.lang.Closure),
> find(groovy.lang.Closure)
> *Caused by:* Error processing GroovyPageView: No signature of method:
> java.util.TreeMap$1.first() is applicable for argument types: () values: []
> Possible solutions: print(java.io.PrintWriter), print(java.lang.Object),
> sort(), find(groovy.lang.Closure), sort(groovy.lang.Closure),
> find(groovy.lang.Closure)
> *Class:* scan.gsp
> *At Line:* [200]
> *Code Snippet:
>
> Have anyone seen this kind of exception before?
> *
>

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