in reply to
I have used Acme::Bleach module to encrypt my cgi source code.
after encrypting, my cgi source file just contains invisible character.
Okay, okay, you caught us out.
We were just joking before when we advised you not
to use Acme modules to protect your source code.
Your code is not functioning
correctly only because its invisibility
is causing it to be ignored by a recent security fix made to the Perl interpreter
to protect it from spoofed backscatter attacks.
To fix your problem, you simply need to restore your code's visibility attribute
by using one of following modules:
Give them a try and let us know which one fixes your problem.