in reply to Tk::waitVariableX - AUTOLOAD failed

The documentation is very laconic, but it seems you should use 
$splash->waitVariableX

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where $splash is Tk::Splashscreen.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In Section Seekers of Perl Wisdom