'backendless\services\Exception' not found

Whenever i m trying to upload an image i m getting this error ‘backendless\services\Exception’ not found . even though the folder and file is present there

Hi Jack

What is your application id ?
Which SDK do you use to upload ?
Please provide full server response

appid= 0923A82B-B68F-F9ED-FF6A-416C744BE100

i m using latest sdk
Fatal error: Class ‘backendless\services\Exception’ not
found in C:\wamp\www\My_Movie\MyMovie_Merchant\src\services\Files.php on
line 92