Getting Permission Denied Error In ExecuteSQL Task

The purpose of the Package is to load an SQL table with data from text files in a subdirectory. The parameter is parsed from the text filenames. It is a zipcode.

I have an ExecuteSQL task inside a ForEach container. The SQL in the task is:

IF EXISTS (SELECT * FROM dbo.ZipCodeRadius
WHERE CenterPostalCode = ?1)
BEGIN
DELETE FROM dbo.ZipCodeRadius
WHERE CenterPostalCode = ?1
END

I also have a Data Flow task in this container which populates the ZipCodeRadius table. The same parameter is also passed to the Data Flow task which specifies a zipcode to delete and afterward load.

I am using Windows authetication for the package.
What am I doing wrong?

Fred