How to upload files to Dropbox ios

Question

I'm trying to upload files to Dropbox. Upload is not working. The upload method is given below.

//  RootViewController.m

-(NSString *)getDocumentPath{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *path = [[paths objectAtIndex:0]stringByAppendingPathComponent:FILENAME];
    return path;
}
-(IBAction)download:(id)sender{
    NSLog(@"download pressed");
    [self.activityIndicator startAnimating];
    [self.restClient loadFile:@"/dbTutorial.plist" intoPath:[self getDocumentPath]];

}
-(IBAction)upload:(id)sender{

    NSLog(@"upload pressed");
    [self.activityIndicator startAnimating];
    NSString *path = [self getDocumentPath];
    [self.itemArray writeToFile:path atomically:YES];
    [self.itemArray uploadFile:FILENAME toPath:@"/" fromPath:path];// When I build this is the warning that I get:NSMutableArray may not respond to -uploadFiletoPath:fromPath


}

Thank you very much. Any help would be greatly appreciated.