I don’t know if this applies to this case at all, or not, but that particular error-message just popped up for me today and I thought I’d briefly mention what it was.

Consider:

'use strict; use warnings; 
  my $foo=[1,2];
  foreach my $bar ($foo) {
  print "bar is $bar\n"}'

bar is ARRAY(0x100804ed0)
[download]

versus ...

'use strict; use warnings;
my $foo=[1,2]; 
foreach my $bar (@{$foo}) { 
print "bar is $bar\n"}'

bar is 1
bar is 2
[download]

The only difference between the two code examples is that, in the second case, @{} has been used i the foreach statement, to tell Perl that it is an array-reference.   When this is done, Perl produces the behavior you probably intended:   it returns each of the elements in the referenced array.   Whereas, in the first example, it returns one thing ... the arrayref itself; the present value of $foo.

If (as was indeed the case in my actual code) the array in question was “a list of objects,” and you wanted to invoke a method against each of those objects, you could get this error.   An arrayref, after all, is not ... (heh) ... “any blessed thing.”