• Since a few days people who try to place an order on my website (www.mrgps.nl) get an error-message.

    Strange thing is: it seems not to occur all the time. At first I was able to reproduce on computer A, while B worked fine. Looked like it was cookie-related; bit now I have the error on computer B as well…

    Probably somehing simple, bit I cannot fin what it is. Please help!!

    The errormessage is:
    Fatal error: Call to undefined method WooCommerce::add_error() in /xxxx/wp-content/plugins/multisafepay/multisafepay.php on line 754

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