Error occurs when saving Android file to external storage

350300 pts.
Tags:
Android
Storage
Inside of my Android app, I'm having an issue with creating a directory and saving a file to it. Here's my code:
String filename = "MyApp/MediaTag/MediaTag-"+objectId+".png";
File file = new File(Environment.getExternalStorageDirectory(), filename);
FileOutputStream fos;

fos = new FileOutputStream(file);
fos.write(mediaTagBuffer);
fos.flush();
fos.close();
However, it's throwing this exception at me:
java.io.FileNotFoundException: /mnt/sdcard/MyApp/MediaCard/MediaCard-0.png (No such file or directory)
Now, I've set the filename to "MyApp/MediaTag-"+objectId+" and it worked but when I create / save the file to another directory, the exception appears again. Anybody know what I'm doing wrong?

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