private void preCheck() throws DynmapInitException {
        /**
         * The Dynmap must contain:
         * standalone/dynmap_config.json
         */
        try {
            dynmapConfigFile = getFile("standalone/dynmap_config.json");
        } catch (IOException e) {
            throw new DynmapInitException(e);
        }

        if (!dynmapConfigFile.exists()) {
            try {
                Thread.sleep(200);
                if (!dynmapConfigFile.exists()) {
                    throw new DynmapInitException("dynmap_config.json in the standalone Folder is missing. Be sure you started the Dynmap");
                }
            } catch (InterruptedException e) {
                throw new DynmapInitException("dynmap_config.json in the standalone Folder is missing. Be sure you started the Dynmap");
            }
        }
    }