Getting error in browser console area (40 to 50 of them!)

Hello, I’d like to start by saying that the plugin looks wonderful. Much better than the original/default captchas. I managed to use it (play around with the drag and drop :P) for a short while before it began messing up. After It started ‘messing up’ the images weren’t draggable and eventually (after a few page reloads) the reset button was no longer visible. I inspected the element with Google Chrome and noticed a very high number of errors in the console. I looked and found that 40 to 50 errors on each reload were being generated due to an issue with https://www.sweetcaptcha.com/min/?f=res/js/captchi.jquery-ui-1.8.6.custom.min.js The errors (all the same) said Uncaught TypeError: Object function (a,b){return new p.fn.init(a,b,c)} has no method 'curCSS' Any known solution for the issue?

https://www.ads-software.com/extend/plugins/sweetcaptcha-revolutionary-free-captcha-service/