Fatal error using Multisite Plugin Manager plugin

I'm getting this error:

Fatal error: Call to undefined function wp_get_current_user() in /wp-includes/capabilities.php on line 1451

When I activate Portfolio Slideshow plugin, Wanguard, and a couple of other plugins. When I active these other plugins in conjunction with Multisite Plugin Manager I get the white screen of death. The Pro Sites plugin is overkill for my purposes. Suggestions?

Thanks

  • Ash

    Hello there

    I hope you are well today and thanks for asking the question.

    It seems a file is missing in your wordpress folder. Would you please update your wordpress to 3.6.1? If you can't update or it's already updated, then please try to upload wp-admin and wp-includes folder again through your ftp. Also please keep a backup of previous files.

    Please let me know if it is helpful and feel free to ask more question if you have.

    Cheers
    Ash

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