SQL Tag Scan Class warnings in console

Why do I keep getting the following messages over and over again in the console? The manual says i can have a slow rate of 0 for a leased scan class.

quote 4:10:49 PM BasicExecutionEngine Modifying an existing execution unit. [Owner=tag scanclasses [sqltags], Name=packagingtransferlinesleased]
(I) 4:10:49 PM BasicExecutionEngine Modifying an existing execution unit. [Owner=tag scanclasses [sqltags], Name=buffertanksleased]
(I) 4:10:49 PM BasicExecutionEngine Modifying an existing execution unit. [Owner=tag scanclasses [sqltags], Name=leased]
(I) 4:10:49 PM BasicExecutionEngine Modifying an existing execution unit. [Owner=tag scanclasses [sqltags], Name=every 5 seconds leased]
[WARN] 4:10:47 PM BasicExecutionEngine Tried to register unit [tag scanclasses [sqltags] leased] with rate of 0. Will be ignored.
[WARN] 4:10:47 PM BasicExecutionEngine Tried to register unit [tag scanclasses [sqltags] packagingtransferlinesleased] with rate of 0. Will be ignored.
[WARN] 4:10:47 PM BasicExecutionEngine Tried to register unit [tag scanclasses [sqltags] every 5 seconds leased] with rate of 0. Will be ignored.
(I) 4:10:44 PM BasicExecutionEngine Modifying an existing execution unit. [Owner=tag scanclasses [sqltags], Name=leased]
[WARN] 4:10:44 PM BasicExecutionEngine Tried to register unit [tag scanclasses [sqltags] buffertanksleased] with rate of 0. Will be ignored.
[WARN] 4:10:44 PM BasicExecutionEngine Tried to register unit [tag scanclasses [sqltags] leased] with rate of 0. Will be ignored.
(I) 4:10:24 PM BasicExecutionEngine Modifying an existing execution unit. [Owner=tag scanclasses [sqltags], Name=every 5 seconds leased]
[WARN] 4:10:21 PM BasicExecutionEngine Tried to register unit [tag scanclasses [sqltags] every 5 seconds leased] with rate of 0. Will be ignored.[/quote]