I just ran into the non-static method should not be called statically error when building out some functionality for a client. In short, I needed to instantiate the class that I was using before running one of those class’ methods. See the initial code that threw the error and the code that fixed it below:
Incorrect Code that threw the non-static method should not be called statically error
$subscribers = ServiceClass::getSubscribers();Correct Code that fixed the error
$service = new ServiceClass();
$subscribers = $service->getSubscribers();