Tweazle

I'm having problems with this extension also. Have used test data in test mode and a real card in live mode and on each occasion I get the following message under the card details input box that says: 'The value must be greater than or equal to 1'. Transaction does not complete in test or live mode. SSL is enabled on the domain. Using stripe version 2.2.2 on Cubecart V6. Any thoughts or advice would be appreciated.