I am currently working on android project and trying to enable DropBox functionality. I've selected the access type to App Only, and I can successfully authenticate and it creates an Apps directory and inside that creates a directory with the name of my app.

When I then try to put a file in the DropBox directory it goes into the DropBoxException catch and in the logcat prints com.dropbox.client2.exception.DropboxUnlinkedException.

I've done a google and from what I've seen this happens if the apps directory has been deleted and so authentication is required to be re-done, but this isn't the case, I have deleted it and I am putting the file straight after doing the authentication.

Below is the code that retrieves the keys and stores the file on dropbox.

AccessTokenPair tokens = getTokens();
UploadFile uploadFile = new UploadFile(context, common, this, mDBApi);
uploadFile.execute(mDBApi);

Below is the code for the getTokens method (don't think this would help but you never know)

private AccessTokenPair getTokens()
{
    AccessTokenPair tokens;
    SharedPreferences prefs = context.getSharedPreferences("prefs", 0);

    String key = prefs.getString("dropbox_key", "");
    String secret = prefs.getString("dropbox_secret", "");
    tokens = new AccessTokenPair(key, secret);

    return tokens;
}

Below is the class that extends the AsyncTask to perform the upload

class UploadFile extends AsyncTask<DropboxAPI<AndroidAuthSession>, Void, bool>
{
    Context context;
    Common common;
    Synchronisation sync;
    DropboxAPI<AndroidAuthSession> mDBApi;

    public UploadFile(Context context, Common common, Synchronisation sync,
            DropboxAPI<AndroidAuthSession> mDBApi)
    {
        this.context = context;
        this.common = common;
        this.sync = sync;
        this.mDBApi = mDBApi;

    }

    @Override
    protected bool doInBackground(DropboxAPI<AndroidAuthSession>... params) {
        try
        {
            File file = new File(Environment.getExternalStorageDirectory() + "/BoardiesPasswordManager/dropbox_sync.xml");
            FileInputStream inputStream = new FileInputStream(file);
            Entry newEntry = mDBApi.putFile("android_sync.xml", inputStream, file.length(), null, null);
            common.showToastMessage("Successfully uploade Rev: " + newEntry.rev, Toast.LENGTH_LONG);
        }
        catch (IOException ex)
        {
            Log.e("DropBoxError", ex.toString());
        } catch (DropboxException e) {
            Log.e("DropBoxError", e.toString());
            e.printStackTrace();
        }
        return null;
    }

I have no idea why it would display the UnlinkedException so any help would be greatly appreciated.