App designer error message

I'm getting error message: "Invalid expression. Check for missing multiplication operator, missing or unbalanced delimiters, or other syntax error. To construct matrices, use brackets instead of parentheses." for this part of the uneditable code. I'm using version 2021b.

Does someone know how to fix this? Thanks.

[dpb]

The actual error is probably a missing close brace or parentheses or string delimiter in the user code before this -- the parser keeps on going until it either finds the needed closing punctuation or until it finally errors. Unfortunately, the error the finally pops up is often not very informative as to the root cause because it can't always detect what was intended and left out. There are undoubtedly other red line indicatiors in the editor ahead of this...

Answer 1

[Image Analyst]

You need a classdef line before that. You're probably missing that.