The above error message IS in Net::Telnet so that makes sense. However, when I run your script against a Cisco router (assuming Cisco based on the commands in your script) it works fine.
I ran it with Net::Telnet versions 3.03 and 3.04 and against a router with Password only and User/Password prompts. Each of the 4 iterations produced the startup config printed to my screen.
If you are connecting to a Cisco device, have a look at Net::Telnet::Cisco as that does the "heavy lifting" for you (waitfor, prompts, etc.) and makes connecting and issuing commands much easier.
In fact, for a script using N::T::C that works, have a look at:
Script:
http://www.vinsworld.com/software/crapps.zip
Perldoc:
http://www.vinsworld.com/software/crapps.html
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