The Directory Proxy Server could not acquire an exclusive lock on file /ds/PingDirectoryProxy/locks/server.lock: The exclusive lock requested for file /ds/PingDirectoryProxy/locks/ server.lock was not granted, which indicates that another process already holds a shared or exclusive lock on that file. This generally means that another instance of this server is already running
If the Directory Proxy Server is not running (and is not in the process of starting up or shutting down) and there are no other tools running that could prevent the server from being started, and the server still believes that it is running, then it is possible that a previously-held lock was not properly released. In that case, you can try removing all of the files in the locks directory before attempting to start the server.
If you wish to have multiple instances running at the same time on the same system, then you should create a completely separate installation in another location on the file system.