$self->{&{\&{$testname}}}->($system); #system is hashref

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... 
Use of uninitialized value $self in concatenation (.) or string
Can't call method "_idown" on an undefined value
Can't call method "_idown" on an undefined value

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The errors suggest that at some point you are invoking one of your methods without argument, thus $self is never initialized. Carp can be very helpful here for recovering the call stack where the error is actually happening, in the calling routine. You could also manually construct a relevant error using caller: 
sub method {
    my $self = shift or die join(", ", caller()), "\n";
...
}

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If I've misdiagnosed the issue (which is plausible given how complex your invocation is), you probably want to learn How can I visualize my complex data structure?.

#11929 First ask yourself `How would I do this without a computer?' Then have the computer do it the same way.

In reply to Re: how to call a sub via variable in library by kennethk
in thread how to call a sub via variable in library by glenn

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