I get Object reference not set to an instance of an object in a simple application

Hello!

I have a simple BizTalk application with the following configuration.
a. One flatFile csv text file as input and a flatfile schema for this csv flat file.
b. One example of how xml output should look like and generate a schema for this xml output.
c. I have created a Map between the OpenSourceSchema and the OpenDistinationSchema.
   OpenSourceSchema is the schema for the csv flat file.
   OpenDistinationSchema is the schema for the output xml file.
d. A custom ReceivePipeLine that use flat file disassembler to tranfer to xml because the input was
  csv flat file. Set the property Document schema to the flat file schema for the Flat file disassembler in the pipeline editor.

What I want to establish is the following.
1. Read the csv flat file which consist of several records and have an output xml file containing
all these records from csv flat file.
2.The output xml file should be according to the example xml output but the data should be according to the existing mapping.

Now to my problem if I remove the map in send port property I get an xml file in the output directory which
consist of all the records from the csv file.This is correct according to the setting that I have done.
But because I need the mapping between the input and the output I use Outbound Maps in the Send Port Property and click on this. In the Outbound Maps I click in the Map field and select the map that I have called simpleMap.
If I now copy my CSV flat file in the In directory it is removed which is OK but I don’t
get anything in the out directory.

If I look in the Event Viewer/Application I have this error message below.
A message sent to adapter “FILE” on send port “SendPort3” with URI “C:\Tony\BizTalk\Laboration4\Out\%MessageID%.xml” is suspended.
 Error details: Object reference not set to an instance of an object.
 MessageId:  {AC40971A-9DFC-4669-BCA6-DB2489323F44}
 InstanceID: {ED08F559-DAF0-4DB1-B846-C34D7DFFAD24}

Can anybody tell me why I get this error message ?

//Tony