<canvas>: canvas-id attribute is undefined

This error message usually occurs in HTML5 canvas elements when the `canvas-id` attribute is not defined or misspelled in the HTML code.

Make sure that the `canvas-id` is defined correctly in the HTML code and matches the name of the variable used to reference the canvas element in your JavaScript code.

Here's an example of the correct syntax for a canvas element with an ID of "myCanvas":

<canvas id="myCanvas"></canvas>

And here's an example of how to reference this canvas element in JavaScript:

var canvas = document.getElementById("myCanvas");

If you still encounter this error, double-check your code for any other syntax errors or missing elements that could be causing the issue.