Under iPrint cleint management tab in iManager when visiting the advanced tab and doing anything i get the following error.

(Error -603) The requested attribute could not be found. In the Directory, if an attribute does not contain a value then the attribute does not exist for the specific object.
I figured that it was something to do with the schema so I tried to reimport the iPrint related schema's and it told me that they where already there and no changes where made.

I'm a bit lost as to what is happening then. Google has been fruitless in even finding someone with the same type of error.