How To Fix the “this.activateMode is not a function” Error in Gutenberg

Imagine you are busy developing a Gutenberg block. You reload the page, and suddenly the editor will break, displaying an The editor has encountered an unexpected error. message. You look into the JavaScript console of your browser, and see a this.activateMode is not a function error.

In this article we’ll look at why this error occurs, and how you can fix it.

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The Beginner’s Guide To Create Guten Block

If you feel lost among all the development setup needed to create a Gutenberg block, then this guide is for you.

We’ll look in detail at how Create Guten Block can be used to simplify Gutenberg block development. We’ll start by looking at the technical implementation of the tool. Afterwards we’ll use it to create and then customise a sample Gutenberg block.

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