I am writing some perl which is giving me an error that I do not understand. 

# x is 2 to the 128th
my $x = Math::BigFloat->new(q(2.0));
$x->bpow(q(128));
# ...more stuff...
# $product starts as x!
  $product = $x->copy();
  $product->bfac();

[download]

The error I get is 

Can't use an undefined value as an ARRAY reference at
    /System/Library/Perl/5.8.6/Math/BigInt/Calc.pm line 899 (#1)
    (F) A value used as either a hard reference or a symbolic referenc
+e must
    be a defined value.  This helps to delurk some insidious errors.
    
Uncaught exception from user code:
    Can't use an undefined value as an ARRAY reference at /System/Libr
+ary/Perl/5.8.6/Math/BigInt/Calc.pm line 899.
 at /System/Library/Perl/5.8.6/Math/BigInt/Calc.pm line 899
    Math::BigInt::Calc::_acmp('ARRAY(0x18690a0)', 'ARRAY(0x18690d0)') 
+called at /System/Library/Perl/5.8.6/Math/BigInt/Calc.pm line 1304
    Math::BigInt::Calc::_fac('Math::BigInt::Calc', 'ARRAY(0x1868fc8)')
+ called at /System/Library/Perl/5.8.6/Math/BigFloat.pm line 1789
    Math::BigFloat::bfac('Math::BigFloat=HASH(0x1868f5c)') called at r
+epeat.pl line 19

[download]

I have googled and not found this question asked before. Can anyone explain what is going wrong? Thanks.

In reply to undefined value as an ARRAY by mgwmgw

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