Are you sure you are on v1.4.13 not 1.4.12 ? That sounds like an error which is supposed to be fixed in 1.4.13.
Have you cleared any caches ?
Have you tested with all other plugins disabled ?
Have you tested with one of the WP default theme's ?
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jrf on "[Plugin: WordPress SEO by Yoast] XML sitemap error with latest version 1.4.13"
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