Error in table widget

Hello, I want to load a list into a table with data from a MySql connector. The output connector is an array of n rows and one column.
The log when I run the task is as follows

04/06/2014 12:11:47 org.bonitasoft.connectors.database.jdbc.JdbcConnector setInputParameters
INFO: username root
04/06/2014 12:11:47 org.bonitasoft.connectors.database.jdbc.JdbcConnector setInputParameters
INFO: password ******
04/06/2014 12:11:47 org.bonitasoft.connectors.database.jdbc.JdbcConnector setInputParameters
INFO: script select pro_nombre from productos
04/06/2014 12:11:47 org.bonitasoft.connectors.database.jdbc.JdbcConnector setInputParameters
INFO: separator null
04/06/2014 12:11:47 org.bonitasoft.connectors.database.jdbc.JdbcConnector setInputParameters
INFO: driver com.mysql.jdbc.Driver
04/06/2014 12:11:47 org.bonitasoft.connectors.database.jdbc.JdbcConnector setInputParameters
INFO: url jdbc:mysql://localhost:3306/cerdos
04/06/2014 12:11:47 org.bonitasoft.connectors.database.jdbc.JdbcConnector setInputParameters
INFO: outputType n_row
04/06/2014 12:11:51 org.bonitasoft.forms.server.FormsServlet getFormFirstPage
GRAVE: Error while getting the first page for application Proceso Cerdos–1.0–Enviar Stock$entry
java.lang.IllegalArgumentException
at org.bonitasoft.forms.server.api.impl.util.FormFieldValuesUtil.getAvailableValues(FormFieldValuesUtil.java:295)
at org.bonitasoft.forms.server.api.impl.util.FormFieldValuesUtil.getTableAvailableValues(FormFieldValuesUtil.java:315)
at org.bonitasoft.forms.server.api.impl.util.FormFieldValuesUtil.setFormWidgetAvailableValues(FormFieldValuesUtil.java:659)
at org.bonitasoft.forms.server.api.impl.util.FormFieldValuesUtil.setFormWidgetValues(FormFieldValuesUtil.java:614)
at org.bonitasoft.forms.server.api.impl.util.FormFieldValuesUtil.setFormWidgetsValues(FormFieldValuesUtil.java:886)
at org.bonitasoft.forms.server.FormsServlet.getFormFirstPage(FormsServlet.java:234)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:561)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
at org.bonitasoft.forms.server.FormsServlet.processCall(FormsServlet.java:138)
at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:643)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:723)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.bonitasoft.console.common.server.login.filter.NoCacheFilter.doFilter(NoCacheFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.bonitasoft.console.security.SessionFixationValve.invoke(SessionFixationValve.java:77)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:861)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:606)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Unknown Source)

Someone who can help me? I’m with some urgency

Thanks!!