Bug: Matrix doesn't work properly

[moojen]

Describe the bug
The matrix question loads in my tests, but when adding the columns and/or the rows, it no longer works.

To Reproduce
Steps to reproduce the behavior:
Simply add the rows and columns by copy/pasting from your guide.

Expected behavior
To see the question working including options and questions.
I've included the package like this: https://unpkg.com/@ditdot-dev/vue-flow-form@2.2.1

Screenshots
new VueFlowForm.QuestionModel({
id: "q_3",
title: "Question title?",
type: VueFlowForm.QuestionType.Matrix,
required: false,
multiple: false,
columns: [
new MatrixColumn({
value: "1",
label: "Very satisfied",
}),
new MatrixColumn({
value: "2",
label: "Satisfied",
}),
],
rows: [
new MatrixRow({
id: "experience",
label: "Rate your overall experience with our product",
}),
new MatrixRow({
id: "documentation",
label: "Rate your overall experience with our documentation",
}),
],
}),

Desktop (please complete the following information):
Latest chrome.

Additional context
Add any other context about the problem here.

[moojen]

Actually I didn't properly check the added code. When importing, I forgot that simply copy & paste doesn't work. I should have added VueFlowForm. in front of MatrixRow and MatrixColumn. My bad!