Custom Sidebars Not Loading in Widget Area

I have just updated my previous post here https://ww.wp.xz.cn/support/topic/create-sidebars-not-working-in-widgets-area?replies=3 (but then noticed it says ‘resolved’)

in this post I was asked to check the JS Console for errors in the Web Dev tools. below is what I just posted today as the response to where my last post left off (question was asked by https://ww.wp.xz.cn/support/profile/wpmudev-support1)’plugin contributor’ who asked:

Hi Paul,

I hope you are well today.

Is it working fine for you using default WordPress theme like Twenty Thirteen?

When using ifeature Pro theme can you check the javascript console for errors?

In Chrome go to “View -> Developer -> Javascript Console” and in Firefox you can go to “Tools -> Web Developer -> Console”

Find information about how to open JavaScript browser console :

http://webmasters.stackexchange.com/questions/8525/how-to-open-the-javascript-console-in-different-browsers
http://codex.ww.wp.xz.cn/Using_Your_Browser_to_Diagnose_JavaScript_Errors

Let me know what errors if any you are getting when you face this issue so that i can troubleshoot it.

Kind Regards,
WPMU DEV

My reply earlier today on the old post:
………….

Just got back to this as it is stopping me from further developing around 7 of my client sites.

Are you saying that I should check my JS Console whilst trying to add a new sidebar in the widgets area? – If so I have tried this in Firefox on http://www.oaktimberframing.com and it shows me this as I try to create a sidebar:

TypeError: c.data.indexOf is not a function

I know nothing about Javascript to be honest so can you advise any further? You can see what I get when i try to add a sidebar and run the JS Console, I have uploaded a link to the image here: http://oaktimberframing.com/wp-content/uploads/2015/04/JS-Console.jpg

Thanks
Paul

https://ww.wp.xz.cn/plugins/custom-sidebars/