I havea seriousproblem,when I runthe transformationsometimes it doescorrectly,whenIrunbacktomakemany mistakes, I attach thelog, any ideas?

2012/05/02 13:16:29 - Spoon - Transformation opened.
2012/05/02 13:16:29 - Spoon - Launching transformation [Carga_Poliflex_Factura]...
2012/05/02 13:16:29 - Spoon - Started the transformation execution.
2012/05/02 13:16:29 - Carga_Poliflex_Factura - Dispatching started for transformation [Carga_Poliflex_Factura]
2012/05/02 13:16:29 - Transformation metadata - Natural sort of steps executed in 0 ms (35 time previous steps calculated)
2012/05/02 13:16:40 - Src_m_producto_P.0 - Finished reading query, closing connection.
2012/05/02 13:16:40 - Select_m_producto_P.0 - Finished processing (I=0, O=0, R=2607, W=2607, U=0, E=0)
2012/05/02 13:16:40 - Srt_KxProducto_P.0 - Finished processing (I=0, O=0, R=2607, W=2607, U=0, E=0)
2012/05/02 13:16:41 - Src_m_producto_P.0 - Finished processing (I=2607, O=0, R=0, W=2607, U=0, E=0)
2012/05/02 13:16:42 - Src_m_cliente_C.0 - Finished reading query, closing connection.
2012/05/02 13:16:42 - Select_m_cliente_C.0 - Finished processing (I=0, O=0, R=1500, W=1500, U=0, E=0)
2012/05/02 13:16:42 - Srt_KxCliente1_C.0 - Finished processing (I=0, O=0, R=1500, W=1500, U=0, E=0)
2012/05/02 13:16:43 - Src_m_cliente_C.0 - Finished processing (I=1500, O=0, R=0, W=1500, U=0, E=0)
2012/05/02 13:17:22 - Src_f_factura_F.0 - Finished reading query, closing connection.
2012/05/02 13:17:22 - Select_f_factura_F.0 - Finished processing (I=0, O=0, R=23202, W=23202, U=0, E=0)
2012/05/02 13:17:22 - Srt_KxCliente_F.0 - Finished processing (I=0, O=0, R=23202, W=23202, U=0, E=0)
2012/05/02 13:17:22 - Src_f_factura_F.0 - Finished processing (I=23202, O=0, R=0, W=23202, U=0, E=0)
2012/05/02 13:17:23 - C.KxCliente=F.KxCliente.0 - Finished processing (I=0, O=0, R=24702, W=23202, U=0, E=0)
2012/05/02 13:17:23 - Select_C.KxCliente=F.KxCliente.0 - Finished processing (I=0, O=0, R=23202, W=23202, U=0, E=0)
2012/05/02 13:17:37 - Src_f_lineafactura_L.0 - linenr 50000
2012/05/02 13:17:38 - Srt_KxFactura_L.0 - Linenr 50000
2012/05/02 13:17:38 - Select_f_lineafactura_L.0 - linenr 50000
2012/05/02 13:17:54 - Src_f_lineafactura_L.0 - Finished reading query, closing connection.
2012/05/02 13:17:54 - Src_f_lineafactura_L.0 - Finished processing (I=92889, O=0, R=0, W=92889, U=0, E=0)
2012/05/02 13:17:54 - Select_f_lineafactura_L.0 - Finished processing (I=0, O=0, R=92889, W=92889, U=0, E=0)
2012/05/02 13:17:54 - Srt_KxFactura_F.0 - Finished processing (I=0, O=0, R=23202, W=23202, U=0, E=0)
2012/05/02 13:17:54 - Select_F.KxFactura=L.KxFactura.0 - linenr 50000
2012/05/02 13:17:54 - Srt_KxProducto_L.0 - Linenr 50000
2012/05/02 13:17:54 - Srt_KxFactura_L.0 - Finished processing (I=0, O=0, R=92889, W=92889, U=0, E=0)
2012/05/02 13:17:54 - F.KxFactura=L.KxFactura.0 - Finished processing (I=0, O=0, R=116091, W=90032, U=0, E=0)
2012/05/02 13:17:54 - Select_F.KxFactura=L.KxFactura.0 - Finished processing (I=0, O=0, R=90032, W=90032, U=0, E=0)
2012/05/02 13:17:54 - Lkp_KxProducto_F.0 - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Because of an error, this step can't continue:
2012/05/02 13:17:54 - Lkp_KxProducto_F.0 - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Error looking up row in database
2012/05/02 13:17:54 - Lkp_KxProducto_F.0 - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Connection reset by peer: socket write error
2012/05/02 13:17:54 - Srt_KxProducto_L.0 - Finished processing (I=0, O=0, R=90032, W=23678, U=0, E=0)
2012/05/02 13:17:54 - L.KxProducto=P.KxProducto.0 - Finished processing (I=0, O=0, R=15403, W=13721, U=0, E=0)
2012/05/02 13:17:54 - Lkp_KxProducto_F.0 - Finished processing (I=0, O=0, R=1, W=0, U=0, E=1)
2012/05/02 13:17:54 - Select_L.KxProducto=P.KxProducto.0 - Finished processing (I=0, O=0, R=9904, W=9904, U=0, E=0)
2012/05/02 13:17:54 - Carga_Poliflex_Factura - Carga_Poliflex_Factura
2012/05/02 13:17:54 - Carga_Poliflex_Factura - Carga_Poliflex_Factura
2012/05/02 13:17:55 - Carga_Poliflex_Factura - All transaction of database connection 'Poliflex' where rolled back at the end of the transformation.
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : There was an unexpected error while handling the database transactions or the closing of it at the end of a transformation. The impacted database connection is called 'DWH_Poliflex'.
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : org.pentaho.di.core.exception.KettleDatabaseException:
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : There was an error while trying to roll back the transactions of connection 'DWH_Poliflex' at the end of the transformation.
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) :
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Unable to get database metadata from this database connection
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : The connection is closed.
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) :
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) :
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.trans.Trans.closeUniqueDatabaseConnections(Trans.java:2050)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.trans.Trans.access$600(Trans.java:117)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.trans.Trans$1.stepFinished(Trans.java:857)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.trans.step.BaseStep.markStop(BaseStep.java:2314)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.trans.step.RunThread.run(RunThread.java:88)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at java.lang.Thread.run(Unknown Source)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Caused by: org.pentaho.di.core.exception.KettleDatabaseException:
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Unable to get database metadata from this database connection
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : The connection is closed.
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) :
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.core.database.Database.getDatabaseMetaData(Database.java:3143)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.core.database.Database.rollback(Database.java:728)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.trans.Trans.closeUniqueDatabaseConnections(Trans.java:2046)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : ... 5 more
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Caused by: com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed.
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDriverError(SQLServerException.java:171)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at com.microsoft.sqlserver.jdbc.SQLServerConnection.checkClosed(SQLServerConnection.java:319)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at com.microsoft.sqlserver.jdbc.SQLServerConnection.getMetaData(SQLServerConnection.java:1710)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : at org.pentaho.di.core.database.Database.getDatabaseMetaData(Database.java:3139)
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : ... 7 more
2012/05/02 13:17:55 - Spoon - The transformation has finished!!
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Errors detected!
2012/05/02 13:17:55 - Carga_Poliflex_Factura - ERROR (version 4.2.1-stable, build 15952 from 2011-10-25 15.27.10 by buildguy) : Errors detected!

When themarktransformationerrors,finishes andinserts nothing