Another thing that will help make your code, or output, more readable is if you wrap it in "code" tags, like this:

<code>

Number found where operator expected at activity.pl line 6, ...

Number found where operator expected at activity.pl line 8, ...

</code>

which will make it look like this:

Number found where operator expected at activity.pl line 6, ...
Number found where operator expected at activity.pl line 8, ...
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You can also use <c> and </c> as shorthand for the code tags.

And don't worry, I had to be instructed about codetags a couple of times until I understood it correctly, when I first joined Perlmonks :-)