Maximum Order and Error Message isn't working properly

[Irvin]

Hi,

 

I've installed this contribution (the latest version 2.1), everything works fine except when I do some testing, it keeps showing the same error message.

 

For instance, I typed in a coupon code which is already expired, but it shows the same error message (invalid coupon used) rather than 'coupon is expired and no longer valid'.

 

Also the Maximum Order doesn't work either. I had maximum order set to $100 and placed an order more than $100 with the Voucher (with max order set to $100), but it allows the transaction to go through.

 

Could you tell me what should I do to fix this please?

 

Thanks very much for a great contribution.