Uncaught Error: This file can't be queued because it has already been processed or was rejected.

[stratboy]

Hi, I need to do some checks before files get uploaded. Specifically, I need not to allow to re-upload the same file twice, so I need to check for that. By following this thread, I'm setting autoQueue: false, and then calling this.enqueueFile() on the 'addedfile' hook. And I'm currently getting this error:

Uncaught Error: This file can't be queued because it has already been processed or was rejected.

By loggin file infos, it seems it's accepted and its status is 'added', so I can't get why I'm getting that error.

Original DZ's source code is the following:

    enqueueFile(file) {
        if (file.status === Dropzone.ADDED && file.accepted === true) {
            file.status = Dropzone.QUEUED;
            if (this.options.autoProcessQueue) return setTimeout(()=>this.processQueue()
            , 0); // Deferring the call
        } else throw new Error("This file can't be queued because it has already been processed or was rejected.");
    }

So it should go and queue... Instead, it goes to the error...

Why? On the stackoverflow thread you can see that there are other people having the same issue.