copylibs doesn't support the "rebase" attribute

This can happen when a NetBeans 7.1 project opens a project with an older version of CopyLibs. The solution is;

- Tools->Libraries
- select the "Library location" that you want to fix (not the Global one)
- select the "CopyLibs Task"
- click the "Remove" button on the lower left corner
- click "Ok"

- In the project explorer right click on the "Libraries" virtual folder under
your project
- click "Add Library..."
- click the "Import" button
- select on "CopyLibs Task"
- click the "Import Library" button
- click the "Cancel" button

This can also happen the other way round i.e. when a version of NetBeans less than 7.1 opens a 7.1 project. The solution is;

- Open the file nbproject/build-impl.xml
- remove the rebase attribute and value from the line the error is coming from which is a <copylibs/> tag