Does anyone has an idea of what can be that? Thanks

Exception thrown from business logic event listener: System.InvalidOperationException: InfoPath ne peut pas excuter d'appels de modle objet li la vue. La vue n'est pas prte. at Microsoft.Office.InfoPath.Server.DocumentLifetime.OMExceptionManager.ExecuteOMCallWithExceptions(OMCall d, ExceptionFilter exceptionFilter) at Microsoft.Office.InfoPath.Server.DocumentLifetime.OMSecurityContext.ExecuteOMCall(Solution solution, SecurityLevel methodSecurityLevel, ExceptionFilter exceptionFilter, OMCall d) at VCFAuditChantier.FormCode.drpChantier_Changed(Object sender, XmlEventArgs e) in C:\Vinci\Projet\VCF.MOSS.APPLICATIONS.AuditChantier\VCFAuditChantier\FormCode.cs:line 3478 at Microsoft.Office.InfoPath.Server.SolutionLifetime.XmlEventExternal.<>c__DisplayClass10.<>c__DisplayClass14.b__d() at Microsoft.Office.InfoPath.Server.Util.DocumentReliability.InvokeBusinessLogic(Thunk thunk) at Microsoft.Office.InfoPath.Server.SolutionLifetime.XmlEventExternal.<>c__DisplayClass20.b__1c() at Microsoft.Office.InfoPath.Server.DocumentLifetime.OMExceptionManager.CallFormCodeWithExceptionHandling(UserMessages userMessages, OMCall d)