Script Component failed the post-execute phase and returned error code 0x80004002

SSIS pakage throw an errror "**[SSIS.Pipeline] Error: Script Component failed the post-execute phase and returned error code 0x80004002.

**" In Script component its shows task run successfully but Control flow task shows Error.

Here is my Script task Code:

public override void CreateNewOutputRows()
{
    #region Getting Variable values 

    // Getting DBPackage variable value. 
    Object varDBPackage;
    IDTSVariables100 vars = null;
    VariableDispenser.LockForRead("User::DBPackage");
    VariableDispenser.GetVariables(out vars);

    // Getting ReportPath variable value. 
    Object varReportPath;
    IDTSVariables100 ReportPath = null;
    VariableDispenser.LockForRead("User::ReportPath");
    VariableDispenser.GetVariables(out ReportPath);

    // Getting GetAllProvidersOutput variable value. 
    Object varGetAllProvidersOutput;
    IDTSVariables100 GetAllProvidersOutput = null;
    VariableDispenser.LockForRead("User::GetAllProvidersOutput");
    VariableDispenser.GetVariables(out GetAllProvidersOutput);

    DataTable dt = new DataTable();
    OleDbDataAdapter da = new OleDbDataAdapter();
    try
    {
        // Assign values into variable
        varDBPackage = (Object)vars["User::DBPackage"].Value;
        varReportPath = ReportPath["User::ReportPath"].Value;
        varGetAllProvidersOutput = GetAllProvidersOutput["User::GetAllProvidersOutput"].Value;

        // Extract the data from the object variable into the table and fetching Description from XML.
        da.Fill(dt, varDBPackage);


    }
    catch (Exception ex)
    {
        varDBPackage = null;
        varReportPath = null;
        varGetAllProvidersOutput = null;
    }
    finally
    {
        vars.Unlock();
        ReportPath.Unlock();
        GetAllProvidersOutput.Unlock();
    }

    #endregion

    String GetAllProvidersOutputPath = String.Format(@"{0}\{1}", varReportPath.ToString(), Convert.ToString(varGetAllProvidersOutput));
    var xDoc = XDocument.Load(GetAllProvidersOutputPath);
    var prefix = xDoc.Root.GetNamespaceOfPrefix("d1p1");

    foreach (DataRow item in dt.Rows)
    {
        string code = item["CODPROVIDERCODE"].ToString().ToUpper();
        string submissionEndDate = item["MAXSUBMISSIONENDDATE"].ToString();
        var node = xDoc.Root.Element(prefix + "AARetrieve")
        .Elements(prefix + "Organization")
        .FirstOrDefault(x => x.Attribute(prefix + "Code").Value.ToUpper() == code);

        string description = string.Empty;
        if (node != null)
            description = node.Elements(prefix + "OrganizationData").FirstOrDefault().Elements().Select(x => x.Attribute("Description").Value).FirstOrDefault();

        Output0Buffer.AddRow();
        Output0Buffer.CODPROVIDERCODE = (item["CODPROVIDERCODE"].ToString());
        Output0Buffer.MAXSUBMISSIONENDDATE = Convert.ToDateTime(item["MAXSUBMISSIONENDDATE"]);
        Output0Buffer.PROVIDERDESCRIPTION = description;
    }
}

Error:

[Script Component [23]] Error: System.InvalidCastException: Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.SqlServer.Dts.Runtime.Wrapper.IDTSVariables100'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{D1A469BC-F371-4D15-832F-BACB50C162E9}' failed due to the following error: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD)). at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.HandleUserException(Exception e) at Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost.PostExecute() at Microsoft.SqlServer.Dts.Pipeline.ManagedComponentHost.HostPostExecute(IDTSManagedComponentWrapper100 wrapper)

I am quite new in SSIS so kindly guide me what causes the Issue.

Thanks