I am getting the following error

Error in solution: Line: 55 Column: 1

Illegal use of reserved keyword "end".

Answer 1

[Matt J]

There are many ways to generate that error. One of them is that you may be using 'end' as the name of a variable, e.g.,

end=1

Illegal use of reserved keyword "end".

Answer 2

[Walter Roberson]

Most likely, you have one too many end statements

I recommend using the editor facility "Smart Indent", which I believe has shortcut alt-i (⌘-I on Mac)