FaceBook Image Upload In API in iOS swift - swift

Question

I am new in iOS . i am trying to convert image or image url into png,or jpg format and failed .plz help me in this matter
#IBAction func FBSignInAct(sender: AnyObject) {
let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
fbLoginManager .logInWithReadPermissions(["email"], fromViewController: self, handler: { (result, error) -> Void in
if (error == nil){
let fbloginresult : FBSDKLoginManagerLoginResult = result
if result.isCancelled {
return
}
if(fbloginresult.grantedPermissions.contains("email"))
{
self.getFBUserData()
}
}
})
}
func getFBUserData(){
if((FBSDKAccessToken.currentAccessToken()) != nil){
FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).startWithCompletionHandler({ (connection, result, error) -> Void in
if (error == nil){
print(result)
let url = NSURL(string: result["picture"]!!["data"]!!["url"]!! as! String)
let email:String = result["email"] as! String
let id:String = result["id"] as! String
let name:String = result["name"] as! String
self.signUpFBControl(email , fbID: id , name: name , profile_PicUrl: url!)
}
})
}
}
func signUpFBControl(email:String,fbID:String,name:String,profile_PicUrl:NSURL)
{
let data = NSData(contentsOfURL: profile_PicUrl)
let profilePic : UIImage = UIImage(data: data!)!
let image:NSData = UIImageJPEGRepresentation(profilePic,1)!
let strBase64:String = image.base64EncodedStringWithOptions(.Encoding64CharacterLineLength)
print(strBase64)
let dataDecoded:NSData = NSData(base64EncodedString: strBase64, options: NSDataBase64DecodingOptions.IgnoreUnknownCharacters)!
print( dataDecoded)
Alamofire.request(.POST, "\(SERVERURL)fb_login", parameters: ["email": email,"fbid": fbID,"name": name ,"profile_pic": image,"user_type":"business" ]).responseJSON { response in
let json = JSON(data: response.data!)
if json["msg"].string == "User Details" {
let data = json["user_details"][0]
print(data)
LoginValue.sharedInstance.setUserLoginInfo(data)
self.reachNextViewController()
} else {
self.alertView("Sign Up Failed", message: json["error_description"].string!, button: "Close", destructive: false,secondButton: "")
}
print(json["error_description"])
}
}
error says
The profile pic must be a file of type: jpeg, jpg, png.