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The current user is not authorized to perform the requested action.
When I using function createFile() to upload image but i have error. how to solve this issue.
TL;DR
Developers are experiencing authorization issues when trying to perform an action. The solution is to update the max filesize to 50MB. If using a free account, check for Create Permissions on the Bucket. The error occurs when using createFile() function to upload an image. 
Does the user have Create Permissions on the Bucket?
I can't because i using account free
Do you mean a free Cloud account? So what?
Here!
Oh right, that's a bug. You'll have to update the max filesize to 50MB I think? Then you can put it back up, IIRC
