It means that $dbh isn't defined, which probably means that either you didn't execute the code required to connect to the database, or that the code to connect to the database failed. The snippet of code you provided to us doesn't show the line where you do connect, so we can't be sure exactly what is wrong. But that's where you should look first.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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