What part of the instructions you got from diagnostics told you to remove the use strict; line? strict prevents you from misspelling variable names, something you do in your code.

Removing strict tells Perl not to tell you about the errors you made in your script. If you add it again, Perl will tell you again about the errors you made. I won't write your code for you, so you'll have to look a bit closer at your program.

As a hint, the two variables %myHash and $myHash are different things in Perl.