Have you determined which of the values it is complaining about (is it maybe RootName => undef, or $data as LanX pointed out)? Have you tried any alternatives, i.e. making sure you're not feeding the function undefs where you shouldn't be? Note the effect of warnings is lexical in scope, so it won't change anything coming from inside of XML::Simple. If that is the case, and you're feeding the function valid data, you could try the following ugly hack to suppress all warnings from inside XMLout (although it's about as ugly as using XML::Simple for XML output in the first place...): my $xmlout = do { local $SIG{__WARN__}=sub{}; XMLout(...) };

Minor edits for clarification.

In reply to Re: "no warnings 'uninitialized'" failing by haukex
in thread "no warnings 'uninitialized'" failing by jest

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.