call_user_func_array() expects parameter 1 to be a valid callback

Strict warning: call_user_func_array() expects parameter 1 to be a valid callback, non-static method Drupal\geocoder_autocomplete\Plugin\Field\FieldWidget\GeocoderAutocomplete::validateFormElement() should not be called statically in Drupal\Core\Form\FormValidator->doValidateForm() (line 277 of /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormValidator.php) #0 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/includes/bootstrap.inc(548): _drupal_error_handler_real(2048, 'call_user_func_...', '/Users/carlosmi...', 277, Array) #1 [internal function]: _drupal_error_handler(2048, 'call_user_func_...', '/Users/carlosmi...', 277, Array) #2 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormValidator.php(277): call_user_func_array(Array, Array) #3 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormValidator.php(235): Drupal\Core\Form\FormValidator->doValidateForm(Array, Object(Drupal\Core\Form\FormState)) #4 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormValidator.php(235): Drupal\Core\Form\FormValidator->doValidateForm(Array, Object(Drupal\Core\Form\FormState)) #5 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormValidator.php(235): Drupal\Core\Form\FormValidator->doValidateForm(Array, Object(Drupal\Core\Form\FormState)) #6 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormValidator.php(235): Drupal\Core\Form\FormValidator->doValidateForm(Array, Object(Drupal\Core\Form\FormState)) #7 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormValidator.php(119): Drupal\Core\Form\FormValidator->doValidateForm(Array, Object(Drupal\Core\Form\FormState), 'node_page_edit_...') #8 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormBuilder.php(571): Drupal\Core\Form\FormValidator->validateForm('node_page_edit_...', Array, Object(Drupal\Core\Form\FormState)) #9 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Form/FormBuilder.php(314): Drupal\Core\Form\FormBuilder->processForm('node_page_edit_...', Array, Object(Drupal\Core\Form\FormState)) #10 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Controller/FormController.php(74): Drupal\Core\Form\FormBuilder->buildForm(Object(Drupal\node\NodeForm), Object(Drupal\Core\Form\FormState)) #11 [internal function]: Drupal\Core\Controller\FormController->getContentResult(Object(Symfony\Component\HttpFoundation\Request), Object(Drupal\Core\Routing\RouteMatch)) #12 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array(Array, Array) #13 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/Render/Renderer.php(574): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #14 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext(Object(Drupal\Core\Render\RenderContext), Object(Closure)) #15 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) #16 [internal function]: Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() #17 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/vendor/symfony/http-kernel/HttpKernel.php(144): call_user_func_array(Object(Closure), Array) #18 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/vendor/symfony/http-kernel/HttpKernel.php(64): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #19 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #20 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #21 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/modules/page_cache/src/StackMiddleware/PageCache.php(99): Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #22 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/modules/page_cache/src/StackMiddleware/PageCache.php(78): Drupal\page_cache\StackMiddleware\PageCache->pass(Object(Symfony\Component\HttpFoundation\Request), 1, true) #23 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #24 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(50): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #25 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #26 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/core/lib/Drupal/Core/DrupalKernel.php(652): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #27 /Users/carlosmirandalevy/Sites/devdesktop/drupal8/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #28 {main}.