Designer notifies you if a lock has been established on your file. You may receive a warning or an error message when opening a design with a lock.
Designer warns you when opening a design that was not closed properly or may be open somewhere else. You can choose to recover the unsaved edits.
When opening a design, you may receive an error that the file cannot be opened because the lock file is old. You cannot recover any unsaved edits.
To open a design with an old lock file:
Go to the design directory.
Locate the design .adb file and corresponding .lok file.
Delete the .lok file.
Return to Designer and open the design.