use csLogs::Error qw(a b) expands to:

BEGIN {
    require csLogs::Error;
    import csLogs::Error qw(a b);
}
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which expands to:

BEGIN {
    require "csLogs/Error.pm";
    csLogs::Error->import( qw(a b) );
}
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and that last line eventually becomes something like one of these:

Exporter::import( "csLogs::Error", qw(a b) );
UNIVERSAL::import( "csLogs::Error", qw(a b) );
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So "csLogs::Error" is used both to find the Error.pm file and to find import(). So you need to get it right. Unfortunately, there is really no enforcement that the file csLogs/Error.pm defines a csLogs::Error::import() or sets @csLogs::Error::ISA= qw(Exporter) and @csLogs::Error::EXPORT.

It would be nice if UNIVERSAL::import() complained about such things so you might find Universally unimportant and overused useful (and important).

        - tye (but my friends call me "Tye")