Unresolved reference: JAVADB_DRIVER_LABEL - missing classpath items.

[njhutc]

I am running NB 6.9.1. In this case, I have a small GUI project backed by a Derby DB. Having got this to work several months ago (probably in NB 6., I shelved it to work on something else. Now, going back to the original GUI project (after several windows updates and having updated NB to 6.9.1) I am getting an unresolved reference. Details:

'Problem: The project uses the class library called "JAVADB_DRIVER_LABEL" but the classpath items of this library are missing.
Solution: Click Resolve to open the Library Manager and locate the missing classpath items of "JAVADB_DRIVER_LABEL" library.'

I am looking for some step by step advice on how to fix this. I can't identify the missing items. I have tried removing the javadb library and re-adding it but that doesn't work.

If I remove javadb then try to run then I get 'ClassNotFoundException: org.apache.derby.jdbc.EmbeddedDriver' which is expected.

Hoping someone can advise. Thanks..