Do you have a correct path specified in the flat file destination?
Note, the the path is related to the machine on which you are running the package and account under which you are executing the package.
So if you have developed the package eg. on one machine and launching on another machine, the destination path can differ.
The same is related to the rights. If you run the package under different account than under which it was developed, then the account under which the package is running needs to have appropriate rights on the destination path.
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