Why the new version 2.7 gives us this error?

I tried few times to install NextGEN Gallery plugin but unfortunately I got this error…
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Unpacking the plugin package

Fatal error: Cannot redeclare class pclzip in /home/shaise0/public_html/wp-admin/includes/class-pclzip.php on line 171

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I did google it and I’ve noticed that actually I’m not the first having this issue.
I also contacted the Owner of PCLZIP here’s his reply to me:

“Unfortunately, I think the problem comes from WP rather than PclZip, and I really don’t know how WP is using PclZip…
Doing a quick google-search on “pclzip WP” I found some similar discussion. May be you can have a look at this :
http://comox.textdrive.com/pipermail/wp-testers/2008-March/007762.html
http://www.mail-archive.com/wp-testers@lists.automattic.com/msg07204.html

Hope this will help you.

Rgds
Vincent”

Looks like a bug and if so I KINDLY ASK THE WP TEAM FOR SUPPORT!
Thank you!