hmm i got the same problem..
email from comments no problem, but also with BigContact, the same error message..
im a totally newbie with wordpress,.. i dont understand any code.. im trying to get better.. but this problem is to big for me now..
need some help also..
my link to my still-under-construction site is: https://www.richardfotografie.nl
the BigContact thingy is to be found under CONTACT