Gtk and Glib::Timeout

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I am writing a program in perl which invokes a small window. This window
should time out after some time. For the window I use Gtk2. For the
timeout I use Glib::Timeout

The code looks something like this:

my $dialog  = new Gtk2::Dialog(  );

(creating some buttons and all)

my $timer = Glib::Timeout->add( $interval, \&some_func));


This returns Not a CODE reference at /program_path line line_number

Should I use Glib (and how?) or is there any other function I should use.

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