None of the code you've posted so far uses Dumper, so seeing all this output from Dumper doesn't help much, since we can't tell what's being Dumped.

If you haven't tried using the perl debugger on this yet (putting perl -d at the start of the command line when you run your script), that's probably what you should do next. Set a break point at the line that causes the error, so that the debugger stops and prompts for input from you when it reaches (but has not yet tried to execute) that line.

When you reach the breakpoint, look at the value of $intersection, and confirm whether or not your hash has a matching key. (According to the error message, it doesn't). Then figure out why $intersection has the value that you see, and/or why the hash doesn't have that as a key.

In reply to Re^3: Tie::DBI works in one script... not the other by graff
in thread Tie::DBI works in one script... not the other by liamclimbguy9k

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.