Error details: The Messaging Engine encountered an error during the processing of one or more inbound messages.

If you have created a flatfile schema, you might run into the following error:

A message received by adapter "FILE" on receive location "..." with URI "D:\dev\TestFlatfileDis\filedrop\*Copy.txt" is suspended.
Error details: The Messaging Engine encountered an error during the processing of one or more inbound messages.

In this case, it might be that your test file is running into an error while reading the lines:

Reason: Unexpected data found while looking for:
'\r\n'
The current definition being parsed is Root. The stream offset where the error occured is 13. The line number where the error occured is 3. The column where the error occured is 2.

To solve this, check that all the lines go until a certain column. If you can't ensure this, you could define the fields (at the end of the line) with MinOccurs=0, so that it can be omitted.