In the Remedy world containers are used to help store the structure of filter and active link guides, web services, packing lists and a few other objects. They're described in the does here - The AR System data dictionary - Documentation for BMC Remedy Action Request System 9.1 - BMC Documentation
The error you're getting suggests there may be some stray data in the in the arcontainer table. Run a db consistency check and see if it reports any related errors - Running the database consistency checker - Documentation for BMC Remedy Action Request System 9.1 - BMC Documentation
I would also delete the workspace directory of developer studio. just to be sure...
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This happens when you try to save/import an object with a name that already exists in a different container...so, for example, as Mark said, both Active Link Guides and Filter Guides are containers, you can't have one of each with the same name. All container objects go into the same table, and even though they are different object types, they can't have the same name because of how they are stored in the metadata, so identify the object that's causing the error and look through your system for another container object by the same name and then either change the existing one, or change the new one to a different name