ContributionsMost RecentMost LikesSolutionsRe: Error: Unable to get property 'prototype' of undefined or null reference Hi, I'm facing the same error when login Myob AccountRight desktop. The error prompted after I entered a valid email and click on "Next". However, if I entered an invalid email (which does't exists), it's prompt me to enter password without prompted the "Unable to get property 'prototype' of undefined or null reference" error. I've tried out all the steps that you provided. However, the issue still persist. Kindly please help on that. Thanks in advance.