Payment problems

Aspose.Words Product Family
1

Subject: System.ArgumentNullException: Value cannot be null (Parameter: source) during checkout

Body:

Hello,

I am attempting to complete a purchase on the site, but I am consistently blocked by a server error during the final stages of the checkout process.

The Error Message: An error has occurred while processing your order! Unexpected error: System.ArgumentNullException: Value cannot be null. Parameter name: source

Technical Details: The console shows a 500 Internal Server Error when calling the following endpoint: https://api.sellize.com/v1.2/customers/current/carts/order

Stack Trace Snippet:

at System.Linq.Enumerable.Select[TSource,TResult](IEnumerable1 source, Func2 selector) at BanckleBilling.BusinessServiceImplementation.SubscriptionsService.AddSubscriptionWithNewCreditCardAndAddress(…) at BanckleBilling.BusinessServiceImplementation.CartsService.OrderCart(…)

Context & Steps to Reproduce:

  1. Added items to the cart.
  2. Entered billing/shipping and credit card information.
  3. Clicked “Place Order” (or equivalent).
  4. The error appears immediately, and the transaction does not go through.

It appears the backend is expecting a list or collection (likely related to discount codes, pricing plans, or address objects) that is being passed as null.

Troubleshooting already attempted:

  • Cleared browser cache and cookies.
  • Tried a different browser.
  • Verified that all required profile and payment fields are populated.

Is this a known issue with the BanckleBilling implementation, or is there a specific configuration in my cart that might be triggering this null reference?

Thank you for your help!

2

@plysytsya It looks like you are trying to buy a discontinued “Document Converter” plugin. Please try the new plugin from here:
https://products.aspose.net/words/document-pdf-converter/

Please let us know if you still encounter the problems.