Hi Cynthia, I hope you are well.

Could you add more context to your flow, such as printscreens, what the screen looks like and other information that makes it easier to understand what you intend to do?

This error usually appears when the component does not find the element.Id.

Example, imagine that I have a container.id but this container is only created (on the screen) after a certain action, so in this case the component will try to read a container that does not yet exist, and this is impossible, hence the error.

In the simplest translation, this error means that the component was unable to find the id of the element you are using in the HTML.

I set it up the same way as in the demo. 

I put a container id and configure the TinyEditorOnChange to save the data into the variable