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sub call_ses {
    my $params = shift;
...

    my $endpoint_name = $endpoint;
}

sub call_ses {

...
   my $endpoint_name = $self->AWS_endpoint;

}

Can't use an undefined value as a HASH reference at
        /usr/share/perl5/vendor_perl/SES.pm line 559 (#1)
...
Uncaught exception from user code:
        Can't use an undefined value as a HASH reference at /usr/share
+/perl5/vendor_perl/SES.pm line 559.
        SES::call_ses('HASH(0x243cc00)', 'HASH(0x26a2138)') called at 
+/opt/aws/apitools/ses/bin/ses-get-stats.pl line 168