I'm new to Hazel, so forgive me if this is a dumb question

I'm creating a rule that renames a file stored on my local drive then moves it to a network drive. All seems to be OK until the move part. The rule fails and the log says this:
- Code: Select all
2012-08-11 07:44:38.029 hazelworker[15984] eStmt_01_31_2006.pdf: Rule Bank of America Statements (WaldoWare) matched.
2012-08-11 07:44:38.327 hazelworker[15984] [File Event] File renamed: /Users/paul/Documents/Action/eStmt_01_31_2006.pdf renamed to /Users/paul/Documents/Action/2006_01 - bankofamerica waldoware statement.pdf.
2012-08-11 07:44:39.197 hazelworker[15984] Error moving file /Users/paul/Documents/Action/2006_01 - bankofamerica waldoware statement.pdf to /Volumes/Paperless/Statements/Bank of America/2006_01 - bankofamerica waldoware statement.pdf: -47 - File is busy (delete)
2012-08-11 07:44:39.197 hazelworker[15984] [Error] Move failed: Could not move file 2006_01 - bankofamerica waldoware statement.pdf from folder /Users/paul/Documents/Action to folder /Volumes/Paperless/Statements/Bank of America.
I have tried manually performing the move in the Finder and there is no problem. Any idea what's going on? Thanks!
Paul