Configuration objects (commerce_payment.commerce_payment_gateway.example_credit_card) provided by commerce_demo alr eady exist in active configuration

I want to reinstall the demo because it failed during the initial installation. I installed commerce_demo and now I can not install it again, what do I do?

I get an error.

In PreExistingConfigException.php line 65:

  Configuration objects (commerce_payment.commerce_payment_gateway.example_credit_card) provided by commerce_demo alr
  eady exist in active configuration