Had you tried the suggested command you'd probably have found the answer. Case counts when installing or calling modules within your code:

cpan CPANPLUS

Forcing it to install is unwise as you may not be made aware of any problems. As I've advised before you need to actually read the output of such tools and do what they tell you. Ignoring such things has cause you many problems in the past when installing modules.

In reply to Re^6: CPANP (CPAN Plus) stopped working - help by marto
in thread CPANP (CPAN Plus) stopped working - help by HelenCr

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