something got messed up in your dependencies.
I suggest
1. make sure you have that file ( Fairy12.... .mp3 ) in that folder
2. Try get get rid of double backslash thingy:
2.2. make copy of your json file. If you screw up on next steps, just copy it back and start over
2.3. find a proper text editor capable of opening huge text files. Notepad++ is probably good for this purpose
2.4. Open the json in editor and search for "Fairy/\\" , then change /\\ to just / .
2.5. save it and open with VaM. Problem will either go away or there will be other problems. Likely this file is not the only one which was imported with such slash-backslash thingy.