BlueMix cf push error

When I was trying to upload a project to blueMix following

  http://www.ibm.com/developerworks/cloud/library/cl-bluemix-fundamentals-create-and-deploy-a-node-app-to-the-cloud/index.html#step2

, I got the following error message:

FAILED Error uploading application. open C:\Boot\BCD: The process cannot access the file because it is being used by another process.

This is because I am running this command under C directory, and this means that I am going to push all the partition, which is not allowed. 

Solution:

Change to another directory, and then push again!