I'm trying to call configure for a widget that is in a different frame to the one the current callback is running from. It doesn't work, I'm getting Tk::Error output. System is Debian Bullseye. code is:

#!/usr/bin/perl
use strict;

use Tk;
use Tk::TFrame;

my $con_but_txt = "Connect";
my $online = 0;

my $rd_b2;

# Set the software version and display it!
my $statusmsg = 'Version 0.1';

#------------
my $mw = MainWindow->new;

#------------
my $seg2_f = $mw->TFrame(-label => 'Segment 2',
                        -relief => 'groove',
                        -borderwidth => 2);

$rd_b2 = $seg2_f->Button(-text => "Read", -state => 'disabled', -comma
+nd => [\&read_seg, 2]);
$rd_b2->grid(-row => 3, -column => 1, -sticky => "e", -padx => 4);

my $ts_e2   = $seg2_f->Text(-wrap => 'word', -width => 50, -height => 
+6)->grid(
                                                        -padx => 4, -p
+ady => 4,
                                                        -row => 0, -co
+lumn => 3,
                                                        -sticky => "ns
+ew", -rowspan => 4);

$seg2_f->grid(-row => 1, -column => 0, -sticky => "nsew",-padx => 2);

#-------------
my $base_f = $mw->Frame( -relief => 'groove',
                        -borderwidth => 2);

my $status = $base_f->Label(-textvariable => \$statusmsg, -borderwidth
+ => 2, -width => 20,
                                -relief => 'groove')->grid(-row => 1, 
+-column => 0,
                                -sticky => "w",-padx => 2,-pady => 3);

my $conn_b = $base_f->Button(-textvariable => \$con_but_txt, -command 
+=> \&connect)->grid(-row => 1,
                                                -column => 3, -sticky 
+=> "e");

$base_f->Button(-text => "Exit", -command => sub {exit})->grid(-row =>
+ 1, -column => 4,
                                                        -sticky => "e"
+);

$base_f->grid(-row => 2, -column => 0, -sticky => "w",-padx => 2);

#-------------

#-----------------------------------------
sub read_seg {
my $cnt;
my $inpstr;
my ($segnum) = @_;
        $statusmsg = sprintf("Reading Segment %d", $segnum);
        $mw->update();
        $mw->after(500);
        $statusmsg = "Online";
        $mw->update();
}

sub connect {
my $cnt;
my $inpstr;

# Connect / Disconnect
#
    if ($online == 0) {
        $online = 1;
        $con_but_txt = "Disconect";
        $statusmsg = 'Online';
    } else {
        $online = 0;
        $con_but_txt = "Connect";
        $statusmsg = 'Offline';
    }
    update_buttons();
}

# Enable/Disable various buttons
#
sub update_buttons {
    if ($online == 0) {  # We are Offline
#       $rd_b2->cofigure(-state => 'disabled');
        $mw->$seg2_f->$rd_b2->cofigure(-state => 'disabled');
    } else {             # We are Online
#       $rd_b2->cofigure(-state => 'normal');
        $mw->$seg2_f->$rd_b2->cofigure(-state => 'normal');
    }
}
[download]

As you can see from update_buttons I've tried just the widget handle and also a chain down from $mw. Both give output like:

Tk::Error: Can't locate auto/Tk/TFrame=HASH(0x55a20d8dde70).al in @INC
+ (@INC contains: /etc/perl /usr/local/lib/x86_64-linux-gnu/perl/5.32.
+1 /usr/local/share/perl/5.32.1 /usr/lib/x86_64-linux-gnu/perl5/5.32 /
+usr/share/perl5 /usr/lib/x86_64-linux-gnu/perl-base /usr/lib/x86_64-l
+inux-gnu/perl/5.32 /usr/share/perl/5.32 /usr/local/lib/site_perl) at 
+./test.pl line 91.
 Carp::croak at /usr/lib/x86_64-linux-gnu/perl-base/Carp.pm line 289
 AutoLoader::autoload_sub at /usr/lib/x86_64-linux-gnu/perl-base/AutoL
+oader.pm line 54
 AutoLoader::AUTOLOAD at /usr/lib/x86_64-linux-gnu/perl-base/AutoLoade
+r.pm line 23
 main::update_buttons at ./test.pl line 91
 main::connect at ./test.pl line 80
 Tk callback for .frame.button
 Tk::__ANON__ at /usr/lib/x86_64-linux-gnu/perl5/5.32/Tk.pm line 251
 Tk::Button::butUp at /usr/lib/x86_64-linux-gnu/perl5/5.32/Tk/Button.p
+m line 175
 <ButtonRelease-1>
 (command bound to event)
[download]

I'm obviously doing something stupid, but it's been 10 years since I wrote any serious Perl and I can't see my mistake. Help please