How to solve this error ?

Answer 1

[Walter Roberson]

Those are warnings, not errors.

You remove the warnings by aligning the end statements with the start of their corresponding control statement.

Typically it is easiest to just highlight all of the code, and press the editor "Smart Indent" button, which is the button that looks vaguely like a Σ character in the lower-middle of the "CODE" portion of the tool ribbon. The button is typically underneath the '%' button.