Warning: S3::inputFile(): Unable to open input file

I am working s3 amazon to upload file.

I found sdk here http://ift.tt/1f6GbQr

its working fine when i run this code separately. When i integrate this code with CI i am getting

Warning: S3::inputFile(): Unable to open input file: C:\xampp\tmp\phpE746.tmp

and its not uploading file. Can anyone have solution.