Upgrade to 1.18 failed on webhosted Installation

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@ 77.1.105.81: The error "Use of undefined constant __DIR__" happens because you do not use PHP 5.3. Either update PHP to PHP 5.3.x or use an older MediaWiki version, which still is compatible with PHP 5.2. This error is the reason for the following errors.

88.130.124.183‎18:23, 12 September 2012

Thanks, figured it out by now. I tried to upgrade to 1.20alpha because of Bug 34310. Backgrading to 1.18 worked.

77.1.105.81‎18:50, 12 September 2012
 
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