Undefined index after web host install.

Hi I've uploaded my website on a free hosting site called 000webhost, it works fine on localhost but however when I try to upload a file to the server using a form I get thrown this error.

Notice (8): Undefined index:  Upload [APP/Controller/UploadsController.php, line 32]
Code
UploadsController::add() - APP/Controller/UploadsController.php, line 32  ReflectionMethod::invokeArgs() - [internal], line ??  Controller::invokeAction() - CORE/Cake/Controller/Controller.php, line 485  Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 103  Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 85  [main] - APP/webroot/index.php, line 96

I can't for the life of me figure out what is going wrong?
I've set the permissions for the webroot/files/uploads folder to 777, so it can't possibly be that. 
Anyone have any ideas?

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