update I couldn't read that badly formated code, so I rewrote it and redid my reply, with proper formatting it become very aparent it was because your @Export had different case than the variable you declared to be global @EXPORT. Also, use our for declaring globals unless you have to work with very old perls.

    package LineParse;
    use XML::Simple;
    use Data::Dumper;
    use strict;
    use Exporter;
    our @ISA = qw(Exporter);
    our @EXPORT = qw(&readconfig );
    our @EXPORT_OK = qw();

    sub readconfig() { # my xml parsing code }
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