# Problem with PayPal add-on
**URL:** https://forum.litium.com/t/problem-with-paypal-add-on/816
**Category:** Questions
**Created:** [April 23, 2019, 11:38am UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816 "2019-04-23T11:38:04Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@jonas.olsson](https://forum.litium.com/u/jonas.olsson)
#### Post date: [April 23, 2019, 11:38am UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816/1 "2019-04-23T11:38:04Z")
Good afternoon!
I installed Litium.Studio.AddOns.PayPal and Litium.Studio.AddOns.PayPal.UI ver 4.7.101 according to instructions in [https://docs.litium.com/documentation/add-ons/payments/paypal/install](https://docs.litium.com/documentation/add-ons/payments/paypal/install)
I added PayPal as payment method on the channel (PayPal: SE EXPRESS\_CHECKOUT).
In checkout I get an error when submitting, “Ett fel inträffade, vänligen försök igen.” and log complains about log4net missing:
```
2019-04-23 11:52:27.9124 [App:13] [13e0f88b-3f46-4cb0-9901-1f241c9b3ae2] [ERROR] [] Litium.Accelerator.Mvc.Controllers.Api.CheckoutController - Error when placing an order System.ComponentModel.Design.CheckoutException (0x80004005): Ett fel inträffade, vänligen försök igen., CheckOutExternalMessage: Could not load file or assembly 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821' or one of its dependencies. The system cannot find the file specified. ---> Litium.Foundation.Modules.ECommerce.Plugins.Payments.PaymentProviderException: Could not load file or assembly 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821' or one of its dependencies. The system cannot find the file specified. ---> System.IO.FileNotFoundException: Could not load file or assembly 'log4net, Version=1.2.10.0, Culture=neutral, PublicKeyToken=1b44e1d426115821' or one of its dependencies. The system cannot find the file specified.
at com.paypal.sdk.profiles.BaseAPIProfile..ctor()
at Litium.Studio.AddOns.PayPal.PayPalAPI.InitializeRequest(NVPCallerServices caller)
at Litium.Studio.AddOns.PayPal.PayPalAPI.SetExpressCheckout(PaymentAction paymentAction, OrderParams orderParams, String returnURL, String cancelURL, String language, String& redirectUrl)
at Litium.Studio.AddOns.PayPal.PayPalProvider.ReserveMoneyFromCustomerAccount(PayPalExecutePaymentArgs paymentArgs, String& redirectUrl, PayPalExecutePaymentResult executePaymentResult, SecurityToken token)
at Litium.Studio.AddOns.PayPal.PayPalProvider.ExecutePayment(ExecutePaymentArgs args, SecurityToken token)
at Litium.Foundation.Modules.ECommerce.Payments.PaymentInfo.ExecutePayment(CheckoutFlowInfo checkoutFlowInfo, SecurityToken token)
--- End of inner exception stack trace ---
at Litium.Foundation.Modules.ECommerce.Payments.PaymentInfo.ExecutePayment(CheckoutFlowInfo checkoutFlowInfo, SecurityToken token)
at Litium.Accelerator.Services.CheckoutServiceImpl.PlaceOrder(CheckoutViewModel model, String responseUrl, String cancelUrl, String& redirectUrl) in C:\git\DynamicCode2\Src\Litium.Accelerator\Services\CheckoutServiceImpl.cs:line 217
at Litium.Accelerator.Services.CheckoutServiceImpl.PlaceOrder(CheckoutViewModel model, String responseUrl, String cancelUrl, String& redirectUrl) in C:\git\DynamicCode2\Src\Litium.Accelerator\Services\CheckoutServiceImpl.cs:line 228
at Litium.Accelerator.Mvc.Controllers.Api.CheckoutController.PlaceOrder(CheckoutViewModel model) in C:\git\DynamicCode2\Src\Litium.Accelerator.Mvc\Controllers\Api\CheckoutController.cs:line 66
```
Litium version: 7.1.0
---
### Author:  [@NilsN](https://forum.litium.com/u/NilsN)
#### Post date: [April 23, 2019, 11:40am UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816/2 "2019-04-23T11:40:08Z")
Just to be 100 percent sure – you did download the zipped log4net.dll on step 5?
---
### Author:  [@jonas.olsson](https://forum.litium.com/u/jonas.olsson)
#### Post date: [April 23, 2019, 11:41am UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816/3 "2019-04-23T11:41:32Z")
No, my bad. I must have used these instructions where there is no step 5.
[https://docs.litium.com/add-ons/payment-providers/paypal](https://docs.litium.com/add-ons/payment-providers/paypal)
Thanks!
---
### Author:  [@NilsN](https://forum.litium.com/u/NilsN)
#### Post date: [April 23, 2019, 11:48am UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816/4 "2019-04-23T11:48:13Z")
Nice catch! Updated the documentation now 🙂
---
### Author:  [@jonas.olsson](https://forum.litium.com/u/jonas.olsson)
#### Post date: [April 23, 2019, 12:18pm UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816/5 "2019-04-23T12:18:55Z")
Thanks again! 🙂
---
### Author:  [@jonas.olsson](https://forum.litium.com/u/jonas.olsson)
#### Post date: [April 23, 2019, 12:45pm UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816/6 "2019-04-23T12:45:03Z")
I tried it now, it works, I’m being redirected to PayPal. But after payment when redirected back to site
`kassa.HandleResponse?Type=Response&token=EC-71C31525XD957220A&PayerID=GLDPCYRZVW3RA`
I only see a blank page.
When I debug CheckoutController.cs in method HandleResponse it looks like callBackResult is null
`var callBackResult = _requestModelAccessor.RequestModel.Cart.PaymentProviderCallbackResult;`
Any ideas of how to proceed with debugging?
---
### Author:  [@jonas.olsson](https://forum.litium.com/u/jonas.olsson)
#### Post date: [April 23, 2019, 1:49pm UTC](https://forum.litium.com/t/problem-with-paypal-add-on/816/7 "2019-04-23T13:49:14Z")
Found it, changed to headlessCheckout=“false” in Litium.Studio.AddOns.PayPal.dll.config, works fine now!
(default is true after installing add-on)