This error comes from the library that manages ZIP formatted archives: http://www.phpconcept.net/pclzip/user-guide/19?showall=1
After a quick web search, two solutions came up:
1) Which version of WordPress are you using? For version 2.8 this seems to be a known and fixed issue. Hence, an update of WordPress could help.
2) You perhaps have to increase your available hosting space.
If it’s nothing of this, searching for your error message + WordPress yields many many results!
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