Simple Checkout in Product - formbehavior not supported

Simple Checkout in Product - formbehavior not supported

Hi,

this addon does not work.

When I try to config (Backend - Options - Addons - Configuration) I get:
Error 500 JHtml: formbehavior not supported. File not found.

When I try to make an order the page simply reloads and no order will be placed.

Any ideas?

Thanks
David

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Aw: Simple Checkout in Product - formbehavior not supported

Compatibility Joomla: 3.x
Compatibility Joomshopping: 4.10.0+