Reporting Server Web Service- (FileShare) CreateSubscription: The value of parameter 'ExtensionSettings' is not valid

Question

I've tried to create a subscription by Web Service api calling the method CreateSubscription and I've an error: 
> The value of parameter 'ExtensionSettings' is not valid. --->
> Microsoft.ReportingServices.Diagnostics.Utilities.InvalidParameterException:
> The value of parameter 'ExtensionSettings' is not valid.
 Below is my code:
ReportingService2010 m_RptManager = new ReportingService2010();     m_RptManager.Url = "<path>/ReportService2010.asmx";     m_RptManager.Credentials = GetCredential();     string filename = Path.GetFileName(m_FileName);     string path = Path.GetDirectoryName(m_FileName);     ParameterValue[] extensionParams = new ParameterValue[7];     for (int i = 0; i < extensionParams.Length; i++)              extensionParams[i] = new ParameterValue();     extensionParams[0].Name = "FILENAME";     extensionParams[0].Value = filename;     extensionParams[1].Name = "FILEEXTN";     extensionParams[1].Value = "False";     extensionParams[2].Name = "PATH";     extensionParams[2].Value = path;     extensionParams[3].Name = "RENDER_FORMAT";     extensionParams[3].Value = m_Format;     extensionParams[4].Name = "WRITEMODE";     extensionParams[4].Value = "Overwrite";     extensionParams[5].Name = "USERNAME";     extensionParams[5].Value = m_UserName;     extensionParams[6].Name = "PASSWORD";     extensionParams[6].Value = m_Password;     ExtensionSettings extensionSettings = new ExtensionSettings();     extensionSettings.Extension = "Report Server FileShare";     extensionSettings.ParameterValues = extensionParams;     MinuteRecurrence pattern = new MinuteRecurrence();     pattern.MinutesInterval = 1;     ScheduleDefinition schedule = new ScheduleDefinition();     schedule.StartDateTime = DateTime.Now;     schedule.EndDateSpecified = false;     schedule.Item = pattern;     XmlSerializer serializer = new XmlSerializer(typeof(ScheduleDefinition));     string dateMatch;     using (StringWriter sw = new StringWriter())            {                serializer.Serialize(sw, schedule);                dateMatch = sw.ToString();            }     string reportPath = "MyReport";     string eventType = "TimedSubscription";     string description = "description";     m_RptManager.CreateSubscription(reportPath, extensionSettings, description, eventType, matchData, GetReportParameters(reportPath));
Where have I wrong? 

Answer 1

Thank for reply, I checked my parameter and I seem that (maybe) is  ok below is my parameters, do you see anything of wrong?
<?xml version="1.0" encoding="utf-16"?>
<ExtensionSettings xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Extension xmlns="http://schemas.microsoft.com/sqlserver/reporting/2010/03/01/ReportServer">Report Server FileShare</Extension>
<ParameterValues xmlns="http://schemas.microsoft.com/sqlserver/reporting/2010/03/01/ReportServer">
<ParameterValue>
<Name xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">FILENAME</Name>
<Value xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">pippo.xls</Value>
</ParameterValue>
<ParameterValue>
<Name xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">FILEEXTN</Name>
<Value xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">False</Value>
</ParameterValue>
<ParameterValue>
<Name xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">PATH</Name>
<Value xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">\\10.4.44.253\D$\Data Applications\DBP\Output\DOMAIN\User\14</Value>
</ParameterValue>
<ParameterValue>
<Name xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">RENDER_FORMAT</Name>
<Value xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">EXCEL</Value>
</ParameterValue>
<ParameterValue>
<Name xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">WRITEMODE</Name>
<Value xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">Overwrite</Value>
</ParameterValue>
<ParameterValue>
<Name xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">USERNAME</Name>
<Value xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">domain\user</Value>
</ParameterValue>
<ParameterValue>
<Name xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">PASSWORD</Name>
<Value xmlns="http://schemas.microsoft.com/sqlserver/2005/06/30/reporting/reportingservices">xxxxxx</Value>
</ParameterValue>
</ParameterValues>
</ExtensionSettings>