Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript Basics (Retired) Introducing JavaScript Using the Console

Posted by Justin Keller
Justin Keller
15,742 Points

Why errors in javascript course

Why are there so many errors on the page itself: Empty string passed to getElementById(). vendor-29d7521dcd9c39592ffad29d2f25e50a.js:137:0 Use of getPreventDefault() is deprecated. Use defaultPrevented instead. vendor-29d7521dcd9c39592ffad29d2f25e50a.js:15:0 Empty string passed to getElementById(). vendor-29d7521dcd9c39592ffad29d2f25e50a.js:137:0 This site makes use of a SHA-1 Certificate; it's recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1.[Learn More] tr TypeError: window.document.getElementById(...) is null cb=gapi.loaded_0:130:226 window.controllers is deprecated. Do not use it for UA detection. nsHeaderInfo.js:412:0 This site makes use of a SHA-1 Certificate; it's recommended you use certificates with signature algorithms that use hash functions stronger than SHA-1.[Learn More] ping Given URL is not allowed by the Application configuration: One or more of the given URLs is not allowed by the App's settings. It must match the Website URL or Canvas URL, or the domain must be a subdomain of one of the App's domains. ping:1:51 window.controllers is deprecated. Do not use it for UA detection. nsHeaderInfo.js:412:0 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at https://ps4.pubnub.com/subscribe/sub-e2de2b5c-13c2-11e2-b508-f53fda4cd93d/836e1955-4500-4f81-9178-f194aa25751e%2Cth-production-b5c32d074e6880710b4a104377efac9c/0/0?uuid=906c9c7c-5c7c-42be-9389-6ca8ad2ad76c&pnsdk=PubNub-JS-Web%2F3.6.7. (Reason: CORS request failed). <unknown> window.controllers is deprecated. Do not use it for UA detection.

Lauren Haygood
Lauren Haygood
16,901 Points

It is usually best to not post the whole error when asking this type of question. It probably isn't a big deal, and has something to do with the page that you launched the console on. Just type clear() into the console and start from there.