Java JAVE - InputFormatException: Permission Denied

Question

I'm trying to convert a .webm to a .mp4 file, but when I run the code, I get a InputFormatException: Permission Denied. I tried this in different directories, too.

        File source = new File(src);
        File target = new File(dest);
        AudioAttributes audio = new AudioAttributes();
        VideoAttributes video = new VideoAttributes();
        EncodingAttributes attrs = new EncodingAttributes();
        attrs.setAudioAttributes(audio);
        attrs.setVideoAttributes(video);
        audio.setCodec("libvorbis");
        audio.setBitRate(64000);
        audio.setSamplingRate(44100);
        audio.setChannels(2);
        audio.setBitRate(192000);
        video.setCodec("libvpx");
        video.setBitRate(250000);
        video.setFrameRate(25);
        attrs.setOutputFormat("webm");
        Encoder instance = new Encoder();
        try {
            instance.encode(new MultimediaObject(source), target, attrs, null);
        } catch (EncoderException e) {
            MessageHandler.error500(comp);
            e.printStackTrace();
        }