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Hello @l_tilford
this issue is most of the time caused by something blocking the JavaScript that should replace the WooCommerce button with our PayPal Smart button. When the WooCommerce button is used, the payment will fail with this error.
There is currently no other workaround available than correcting the thing that is affecting the JavaScript from performing its function.
In the near future we hope to resolve this issue completely with updates on the inner working of this button, but for now you should work on the items that are affecting our button in order to avoid this from happening.
Kind regards,
Joost