[Help] Bungee instalation

 ./server.sh
Starting bungee...
Starting the proxy server...
Could not register logger!
java.io.IOException: Couldn't get lock for proxy.log
        at java.util.logging.FileHandler.openFiles(FileHandler.java:389)
        at java.util.logging.FileHandler.<init>(FileHandler.java:363)
        at net.md_5.bungee.log.BungeeLogger.<init>(BungeeLogger.java:22)
        at net.md_5.bungee.BungeeCord.<init>(BungeeCord.java:161)
        at...