U5 Hackathon - still getting uistring errors

setProperty() value parameter value () is not a uistring.
setText() text parameter value () is not a uistring.
Student code

If the above link doesn’t work, please look at the REMIX link

The problem is that outputString is a list and not a String. You need to create a string and concatenate all the items from the list into the string and then set the text to that string.