Unable to load Kettle-Transformation

Hi,


I am facing the error in pentaho biserver-ce, I have uploaded one .prpt file into the biserver.it is imported properly, and iam able to see the file in reporting tool.
when i tried to view the data it giving error like

16:01:50,195 ERROR [AbstractReportProcessor] 435808023: Report processing failed.
org.pentaho.reporting.engine.classic.core.ReportDataFactoryException: Unable to load Kettle-Transformation
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.KettleTransFromFileProducer.loadTransformation(KettleTransFromFileProducer.java:139)
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.AbstractKettleTransformationProducer.performQuery(AbstractKettleTransformationProducer.java:230)
at org.pentaho.reporting.engine.classic.extensions.datasources.kettle.KettleDataFactory.queryData(KettleDataFactory.java:96)
at org.pentaho.reporting.engine.classic.core.CompoundDataFactory.queryStaticInternal(CompoundDataFactory.java:171)
at org.pentaho.reporting.engine.classic.core.CompoundDataFactory.queryStatic(CompoundDataFactory.java:153)
at org.pentaho.reporting.engine.classic.core.cache.CachingDataFactory.queryInternal(CachingDataFactory.java:416)


And that .prpt file is taken from cassnadra data.


please help me out with solution.


Thank you