I think 1.52 is borked. Looking at the source of the module, the author is pretty good about checking whether $self->{SECRETKEY} is a reference or not. However, on line 176, the author doesn't check and just uses it as a reference:

if ($2 eq $self->{SECRETKEY}->{ID}) {
[download]

That seems to be what produced your error message. A simple fix would be to change line 176 to this:

if ($2 eq (ref($self->{SECRETKEY}) ? $self->{SECRETKEY}->{ID} : $self-
+>{SECRETKEY}) ) {
[download]