Error creating thumbnail: Invalid thumbnail parameters

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Error creating thumbnail: Invalid thumbnail parameters is an error message generated by MediaWiki when it encounters a file too large to thumbnail. Configuring MediaWiki to use ImageMagick seems to solve the problem -- make sure the following is set in LocalSettings.php: 

$wgUseImageMagick = TRUE;

There may be other possible causes for this message, but oversize images (PNG or JPG) seems to be the main one.

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