ERROR: Unable to get property 'prototype' of undefined or null reference

Sorry to hear that.  I just did this on another colleague's computer that was having the same issue and it worked for her.  Two things to check - also add www.myob.com to the Allowed to Use Javascript just for good measure, but also ensure you have added the whole URL string listed in your Javascript script error page - see below - ie (it will then show just as https://id.myob.com on the Javascript page in Chrome).  And then close down Chrome.  Also, in the first instance after adding this to Chrome settings, I kept clicking Yes and it allowed me to get to each page of the log in even though the fonts looked all weird!:

https://id.myob.com/u/mfa-otp-challenge?state=hKFo2SBsNE1YcDV4YXFVZC1SdDRiU3RaamtJXzVITG42bDlHMKFusG1mYS1hdXRoZW50aWNhdGWjdGlk2SB1Rl9ZTFM2UEZZQk

QzWjQtTXlia1FPXzF0bk9Sa2oyX6NjaWTZIDFpWjBjYm93bjRkc2lwUHdJbWlJZnlNWTltVkE3ZG1i

Sorry that string got split then!  Should be something like this :)

https://id.myob.com/u/mfa-otp-challenge?state=hKFo2SBsNE1YcDV4YXFVZC1SdDRiU3RaamtJXzVITG42bDlHMKFusG1mYS1hdXRoZW50aWNhdGWjdGlk2SB1Rl9ZTFM2UEZZQkQzWjQtTXlia1FPXzF0bk9Sa2oyX6NjaWTZIDFpWjBjYm93bjRkc2lwUHdJbWlJZnlNWTltVkE3ZG1i

Hi CRobinsonKPBP 

Thank you for your post. I'd like to extend you a warm welcome to the Community Forum. I hope you find it a valuable resource.

This is a known error and we have some steps to help you with resolving these error:

• Clear the browsing data by going into Control Panel and Selecting Internet Options;
• Then under Browsing History select delete     

As this involve deleting data from your computer we recommend to speak with your IT in relation to impacts and ensuring this task is completed for your environment.

Please feel free to post again I'm happy to assist.

If my response has answered your enquiry please click "Accept as Solution" to assist other users find this information.

Cheers,

Princess

Hello,

I am having this same issue. I have followed all of these steps including manually deleting the files through settings. Plus uninstalled and reinstalled.

What else can I do to fix this?

We are the same here too - two different users.  Clearing cache and broswer history does not work.

I am also having this problem today with Script Errors.  I have cleared my cache, deleted temporary files, and deleted the contents of the file in General Internet Options as recommended in other posts.  I need to process my payroll today.  Is this happening because MYOB are changing the login screens?  How can MYOB help me today?

Ok, I seemed to have found a fix for me anyway - hopefully it stays that way!

In Chrome, go to 'Settings', 'Privacy & Security', 'Site Settings', 'Javascript'.  At the bottom under 'Allowed to Use Javascript', add https://id.myob.com, or I added the whole strong of the error that was being thrown up in the javascript error screen

Thanks so much for sharing! Unfrotunately this also hasn't worked for me :-(

Hi abailey,

Thanks for your post and welcome to the Community Forum! 

May we know if the resolution provided by dddddddddd worked for you? 

Here are some steps to attempt to resolve the error:

1. Add MYOB as a trusted site in Internet Explorer settings
2. Clear the browser cache including cookies by going to  Windows Control Panel>>Internet Options, within theInternet Properties under Browsing history select Delete..., ensuring that the first 4 options are enabled before selecting Delete
3. Go to Windows Control Panel>>Internet Options, click Settings under the General tab, click View files, delete the contents of the folder

Since this task involves deleting data from the computer, we strongly recommend consulting with an IT professional to assess the potential impacts and ensure it is carried out appropriately for your specific environment.

Regards
Earl