Attempting to restore a saved shelf which is saved in rules that are not properly nested with respect to each other.
#6075 Run-time catchable error
Attempting to restore a saved shelf which is saved in rules that are not properly nested with respect to each other.
Additional Information
For X 'Y'.
where X is the type of the shelf, Y its name.
Explanation
Scopes over which a shelf is saved and restored must not
overlap. This error occurs when a shelf is saved in more than one
domain concurrently, and the scopes overlap.