I don't use Dancer2, but I do use TT. You have not shown the contents of login.tt but it is highly likely that your new installation has a newer version of TT also. Perhaps vastly newer.
I would suggest replacing login.tt temporarily with a trivial file which should just display "Hello World" or similar. If that works, then your template is the problem and you can then investigate that file further.
🦛
In reply to Re: Why won't my Dancer2 app render any output???
by hippo
in thread Why won't my Dancer2 app render any output???
by traveler
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