@HOSNAPPP
I installed this on my dev site.
Now, I am not getting an error like you are- but I am finding that no longer are the emails being automatically sent to the vendors. At least not yet– I have checked my vendor box for a half hour periodically and it has not arrived.
So- I am not sure why this is not working any longer…
I know for sure it worked in the past when you would remove the email in the wp admin > woocommerce > settings, and leave it blank.
