Fatal Errors

  • Hi – We are using wordpress 4.1.1 with Yoast 1.7.4 – when we activate yoast we get the following message

    Fatal error: Class ‘WPSEO_OpenGraph’ not found in ….. on line 275

    and if we then disable the social OG (which we do need)

    we then get

    Fatal error: Class ‘WPSEO_Replace_Vars’ not found in ….. on line171

    Does anyone know why this could be happening or how we can resolve

    Many thanks in advance

    https://www.ads-software.com/plugins/wordpress-seo/

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