AAAR Plugin - Error Executing AAAR_Extract.sh

Hi all,
I just installed the "A.A.A.R. – Alfresco Audit Analysis and Reporting" plugin from the pentaho Marketplace (as described here http://fcorti.com/alfresco-audit-analysis-reporting/) and I'm facing the following error.

My Alfresco installation use a postgres DB (9.0.x) while kettle and datamart use a Mysql DB (5.1).

Thank you in advance for help.

Tommaso

2014/03/04 12:30:39 - Cmis Input documents before last update.0 - ERROR (version 5.0.1-stable, build 1 from 2013-11-15_16-08-58 by buildguy) : Unexpected error
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - ERROR (version 5.0.1-stable, build 1 from 2013-11-15_16-08-58 by buildguy) : org.pentaho.di.core.exception.KettleStepException:
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - Unable to get queryfields for SQL:
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - select
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:objectId,
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:name,
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:contentStreamLength,
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:lastModificationDate
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - from
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:document
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - where
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:lastModificationDate < TIMESTAMP '2001-01-01T00:00:00.000+00:00'
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - and (
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:contentStreamLength > 0
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - or (
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:contentStreamLength = 0
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - and cmis:name >= ''
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - ))
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - order by
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:contentStreamLength asc,
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - cmis:name asc
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - Internal Server Error
2014/03/04 12:30:39 - Cmis Input documents before last update.0 -
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at it.francescocorti.kettle.cmis_input.CmisInputMeta.getFields(Unknown Source)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at it.francescocorti.kettle.cmis_input.CmisInput.processRow(Unknown Source)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.pentaho.di.trans.step.RunThread.run(RunThread.java:60)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at java.lang.Thread.run(Thread.java:744)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - Caused by: org.apache.chemistry.opencmis.commons.exceptions.CmisRuntimeException: Internal Server Error
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.apache.chemistry.opencmis.client.bindings.spi.atompub.AbstractAtomPubService.convertStatusCode(AbstractAtomPubService.java:487)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.apache.chemistry.opencmis.client.bindings.spi.atompub.AbstractAtomPubService.post(AbstractAtomPubService.java:629)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.apache.chemistry.opencmis.client.bindings.spi.atompub.DiscoveryServiceImpl.query(DiscoveryServiceImpl.java:145)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.apache.chemistry.opencmis.client.runtime.SessionImpl$3.fetchPage(SessionImpl.java:600)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.apache.chemistry.opencmis.client.runtime.util.AbstractIterator.getCurrentPage(AbstractIterator.java:132)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.apache.chemistry.opencmis.client.runtime.util.AbstractIterator.getTotalNumItems(AbstractIterator.java:70)
2014/03/04 12:30:39 - Cmis Input documents before last update.0 - at org.apache.chemistry.opencmis.client.runtime.util.AbstractIterable.getTotalNumItems(AbstractIterable.java:94)