Crystal Reports .Net Error !!

Hello, (sorry, i´m brazilian and my english is not so good !)
in some machines i have a problem when using the setdatasource method of the
reportdocument objetc

CrystalDecisions.CrystalReports.Engine.InternalException: Error in File
f:\SIMOB\REP\resdepcc.rpt:
The request could not be submitted for background processing.
at .K(String 
, EngineExceptionErrorID  )
at .F(Int16 , Int32 )
at
CrystalDecisions.CrystalReports.Engine.ReportDocument.SetDataSource(Object
value)
at SIMOB.Frm_RRelat.SetDataSource(String Str_Sql, ReportDocument&
Rpd_Doc)
at SIMOB.Frm_RRelat.Btn_Imprimir_Click(Object sender, EventArgs e)

This error occurs in some machines, but not every then. The package is the
same for every then.

Is there anybody who knows this problem?
Thankyou !!
Nelson Rodrigo