Ui string problem

I have a student getting the error, “WARNING: Line: 39: setText() text parameter value (undefined) is not a uistring.ERROR: Line: 39: TypeError: Cannot read properties of undefined (reading ‘toString’)”I’m not sure why all of them are getting the error. Can you help?

Here is your first clue:
What does the dogs function do? Why does it need to use the size variable in some way?There is an attempt to not need size. We have if (breedGroupList[i] == "toy") {. Let’s try an experiment.
“Toy” and “toy” are not equal. Which one of those two is in the database?

For your second clue let’s try some simple code:
Now let’s run it:
We get undefined. Does that sound familiar at all?

Recap those two clues. Trying to get something from an empty array returns undefined. “toy” is not in the database. What is wrong?

Once I changed it to “Toy” it worked. Thanks.