wierd error

["Basil Saragoza" <snortlst () hotmail com>]

Just installed acid. When I fire it up it shows me the error in the browser:
PHP error: Incompatible version. Version 4.1.1 is too old please upgrade to
4.0.4 or later.

weird, uh? 4.1.1 looks like later than 4.0.4.
Should I downgrade to 4.0.4?

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