Invalid filehandle error from utlfile

We are getting the invalid_filehandle error after outputting a dozen
rows of data.  The error started after an extra column was added to the
output line.  This column is coming from a table.  If we hard code the
entry in place of the database column - it works.  However, if use the
database column we get the error.  We do get output for some and then
hit the row that is causing a problem.  What conditions would cause this
kind of error.
Jeffrey Beckstrom
Database Administrator
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
Cleveland, Ohio 44113

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