Unable to create the "app/uploads/nameof the folder/1578/3" directory Lravel4 on Digital Ocean server - laravel-4

Question

I my code is throwing error
Unable to create the "app/uploads/Rescom Summit Bangalore 2016/1578/3" directory
if (Input::file($key)->isValid()) {
$destinationPath = 'app/uploads/'.$event.'/'.$userid.'/3'; // upload path
$extension = Input::file($key)->getClientOriginalExtension(); // getting image extension
$name = Input::file($key)->getClientOriginalName();
$curFilesize = Input::file($key)->getClientSize();
$mime =Input::file($key)->getMimeType();
// dd($mime);
//$fileName = $name; // renameing image
//$exstFileSize = Input::file($destinationPath, $fileName);
if (!File::exists($destinationPath."/boq-".$name)){
//creating details for saving inthe file_handler Table
$fileTblObj->user_id = $userid;
$fileTblObj->eventName = $event ;
$fileTblObj->fileName = "boq-".$name;
$fileTblObj->formPage =3 ;
$fileTblObj->filePath = $destinationPath."/";
$fileTblObj->mime= $mime;
$ans->answer_text = 'Yes';
Input::file($key)->move($destinationPath, "boq-".$name); // uploading file to given path
//Input::file($key)->move($boqPath, $boqname); // uploading file to given path
//Save filedetails
$fileTblObj->save();
$ans->save();
Session::flash('success', 'Upload successfully');
}else if(File::size($destinationPath."/".$name) != $curFilesize){
$fileDtls = $fileTblObj->where('uid',$userid)->where('fileName',$name)->where('formPage',3)->first();
Input::file($key)->move($destinationPath, $name);
$ans->answer_text = 'Yes';
$ans->save();
$fileTblObj->where('id',$fileDtls->id)->update(array('updated_at'=>date("Y-m-d h:m:s",time())));
}
//return Redirect::to('upload');
}
Also in the Browser I am getting
protected function getTargetFile($directory, $name = null)
{
if (!is_dir($directory)) {
if (false === #mkdir($directory, 0777, true)) {
throw new FileException(sprintf('Unable to create the "%s" directory', $directory));
}
} elseif (!is_writable($directory)) {
This completely works fine on my local system
I have changed the permission
chmod -R 777 /var/www/laravel/app
Can anyone help me out with this
Thanks