Here are some possible error conditions and suggested solutions for them.
You get a 602 error (No such value) when querying the catalog
This means that a scheduled catalog update has not occurred.
Solution: Perform a manual update.
This indicates that the Catalog object has insufficient rights to the Directory. The Catalog object needs Browse and Read rights to the objects and properties that it's supposed to include.
Solution: You have to assign these rights. To find out how, go to Assign Rights to the Catalog Object.