Help needed with setting up MySql with Orbeon Xforms

> Hello,
>
> I am new to Orbeon Xforms. I am trying to setup MySql as database for Xforms.
> I followed the instructions given in the following link:
>
> http://wiki.orbeon.com/forms/doc/developer-guide/form-runner/mysql-persistence-layer
>
> But when I try to save the form, I get the following error:
>
> "ERROR XFormsServer  - xforms-submit-error - setting throwable {throwable:
> "org.orbeon.oxf.xforms.submission.XFormsSubmissionException:  (processing
> submission response): xforms:submission for submission id:
> fr-create-update-submission, error code received when submitting instance: 500
> null, line -1, column -1: xforms:submission for submission id:
> fr-create-update-submission, error code received when submitting instance: 500"
>
>
> Appreciate your help on this.
>
>
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