Wappler Server Sided Data Entry Validation

Hi guys,

I am just stuck on a bit of an issue with entry validation. So basically I followed the tutorial pretty much exact for ‘Email already exists’ validation. The tutorial is here (https://docs.wappler.io/t/check-if-a-database-record-already-exists-before-inserting-a-new-entry/2847)

The system does work, its just I receive an error in the console (“Failed to load resource: the server responded with a status of 400”) and I do not get the desired validation message appear in the form.

Here is an image so you get the idea of what I am getting: http://ibb.co/3dPgzr3

So what should be happening is no console errors and a message displayed in the modal form stating that the username already exists.

Here are my validate options:

Here are my input properties for the username input box

Any help would be much appreaciated!
Kind Regards,
Oska