Hi Marianol, I followed your instructions but got the following error: Mensaje de error net.sf.jasperreports.engine.JRRuntimeException: org.exolab.castor.xml.MarshalException: The class for the root element 'xlsdataadapter' could not be found.{File: [not available]; line: 2; column: 76} Traza de error net.sf.jasperreports.engine.JRRuntimeException: org.exolab.castor.xml.MarshalException: The class for the root element 'xlsdataadapter' could not be found.{File: [not available]; line: 2; column: 76} at net.sf.jasperreports.util.CastorUtil.read(CastorUtil.java:263) at net.sf.jasperreports.repo.CastorObjectPersistenceService.load(CastorObjectPersistenceService.java:75) at net.sf.jasperreports.repo.CastorDataAdapterPersistenceService.load(CastorDataAdapterPersistenceService.java:62) at net.sf.jasperreports.repo.DefaultRepositoryService.getResource(DefaultRepositoryService.java:187) at .... How could I fix it? Thank you!