LISDKErrorAPIDomain错误403

我的代码是

func didLinkedinBtnPressed(cellObject: MyModel) {

        let tmp = ["comment": cellObject.strSocialText!,
                   "content": ["title":"AppName", "description":cellObject.strSocialText!,"submitted-url":cellObject.strWebSite!,"submitted-image-url":cellObject.strImageUrl!],"visibility": ["code": "anyone"]] as [String : Any]
        print("PostDtaa = \(tmp)")
        let postData = try? JSONSerialization.data(withJSONObject: tmp, options: .prettyPrinted)

        let url = NSString(string:"https://api.linkedin.com/v1/people/~/shares?format=json")

        let permissions: [AnyObject] = [LISDK_BASIC_PROFILE_PERMISSION as AnyObject, LISDK_EMAILADDRESS_PERMISSION as AnyObject,LISDK_W_SHARE_PERMISSION as AnyObject]

        LISDKSessionManager.createSession(withAuth: permissions, state: nil, showGoToAppStoreDialog: true, successBlock: { (success) -> () in
            if LISDKSessionManager.hasValidSession() {

                LISDKAPIHelper.sharedInstance().postRequest(url as String, body: postData, success: { (_ response) in
                    print(response ?? "")
                   self.simpleAlert(titleOfAlert: "Success", messageOfAlert: "Shared Successfully")


                    LISDKAPIHelper.sharedInstance().cancelCalls()
                    LISDKSessionManager.clearSession()

                }, error: { (_errorRes) in
                    print(_errorRes?.localizedDescription ?? "No Error!!!")



                    LISDKAPIHelper.sharedInstance().cancelCalls()
                    LISDKSessionManager.clearSession()

                })
            }

        }, errorBlock: { (error) -> () in
            print("%s", "error called!")

            LISDKAPIHelper.sharedInstance().cancelCalls()
            LISDKSessionManager.clearSession()
        })
    }

为什么我在这里遇到403错误?