diff --git a/code/Controllers/CMSMain.php b/code/Controllers/CMSMain.php
index f5f3113c..fb764e01 100644
--- a/code/Controllers/CMSMain.php
+++ b/code/Controllers/CMSMain.php
@@ -49,6 +49,7 @@ use SilverStripe\ORM\DB;
 use SilverStripe\ORM\FieldType\DBHTMLText;
 use SilverStripe\ORM\HiddenClass;
 use SilverStripe\ORM\SS_List;
+use SilverStripe\ORM\ValidationResult;
 use SilverStripe\ORM\Versioning\Versioned;
 use SilverStripe\Security\Member;
 use SilverStripe\Security\Permission;
@@ -983,12 +984,10 @@ class CMSMain extends LeftAndMain implements CurrentPageIdentifier, PermissionPr
 			new FieldList()
 		)->setHTMLID('Form_ListViewForm');
 		$listview->setAttribute('data-pjax-fragment', 'ListViewForm');
-		$listview->setValidationResponseCallback(function() use ($negotiator, $listview) {
+		$listview->setValidationResponseCallback(function(ValidationResult $errors) use ($negotiator, $listview) {
 			$request = $this->getRequest();
 			if($request->isAjax() && $negotiator) {
-				$listview->setupFormErrors();
 				$result = $listview->forTemplate();
-
 				return $negotiator->respond($request, array(
 					'CurrentForm' => function() use($result) {
 						return $result;
diff --git a/code/Controllers/CMSPageAddController.php b/code/Controllers/CMSPageAddController.php
index 829a5288..60113417 100644
--- a/code/Controllers/CMSPageAddController.php
+++ b/code/Controllers/CMSPageAddController.php
@@ -17,6 +17,7 @@ use SilverStripe\Forms\TreeDropdownField;
 use SilverStripe\ORM\DataObject;
 use SilverStripe\ORM\FieldType\DBField;
 use SilverStripe\ORM\ValidationException;
+use SilverStripe\ORM\ValidationResult;
 use SilverStripe\Security\Member;
 use SilverStripe\Security\Security;
 
@@ -146,12 +147,10 @@ class CMSPageAddController extends CMSPageEditController {
 		)->setHTMLID('Form_AddForm');
 		$form->setAttribute('data-hints', $this->SiteTreeHints());
 		$form->setAttribute('data-childfilter', $this->Link('childfilter'));
-		$form->setValidationResponseCallback(function() use ($negotiator, $form) {
+		$form->setValidationResponseCallback(function(ValidationResult $errors) use ($negotiator, $form) {
 			$request = $this->getRequest();
 			if($request->isAjax() && $negotiator) {
-				$form->setupFormErrors();
 				$result = $form->forTemplate();
-
 				return $negotiator->respond($request, array(
 					'CurrentForm' => function() use($result) {
 						return $result;
@@ -198,13 +197,7 @@ class CMSPageAddController extends CMSPageEditController {
 
 		$record = $this->getNewItem("new-$className-$parentID".$suffix, false);
 		$this->extend('updateDoAdd', $record, $form);
-
-		try {
-			$record->write();
-		} catch(ValidationException $ex) {
-			$form->sessionMessage($ex->getResult()->message(), 'bad');
-			return $this->getResponseNegotiator()->respond($this->getRequest());
-		}
+		$record->write();
 
 		$editController = CMSPageEditController::singleton();
 		$editController->setCurrentPageID($record->ID);
diff --git a/code/Controllers/CMSPageEditController.php b/code/Controllers/CMSPageEditController.php
index 04f2539b..359943db 100644
--- a/code/Controllers/CMSPageEditController.php
+++ b/code/Controllers/CMSPageEditController.php
@@ -3,6 +3,7 @@
 namespace SilverStripe\CMS\Controllers;
 
 use SilverStripe\Admin\AddToCampaignHandler;
+use SilverStripe\Control\Controller;
 use SilverStripe\Control\HTTPRequest;
 use SilverStripe\Control\HTTPResponse;
 use SilverStripe\Core\Convert;
@@ -54,15 +55,14 @@ class CMSPageEditController extends CMSMain {
 		if (is_null($results)) {
 			return null;
 		}
-		$request = $this->getRequest();
-		if($request->getHeader('X-Formschema-Request')) {
-			$data = $this->getSchemaForForm($handler->Form($record));
-			$data['message'] = $results;
 
-			$response = new HTTPResponse(Convert::raw2json($data));
-			$response->addHeader('Content-Type', 'application/json');
-			return $response;
+		if($this->getSchemaRequested()) {
+			// Send extra "message" data with schema response
+			$extraData = ['message' => $results];
+			$schemaId = Controller::join_links($this->Link('schema/AddToCampaignForm'), $id);
+			return $this->getSchemaResponse($schemaId, $form, null, $extraData);
 		}
+
 		return $results;
 	}
 
diff --git a/code/Model/SiteTree.php b/code/Model/SiteTree.php
index da6abc78..ed08b616 100755
--- a/code/Model/SiteTree.php
+++ b/code/Model/SiteTree.php
@@ -44,6 +44,7 @@ use SilverStripe\ORM\DB;
 use SilverStripe\ORM\HiddenClass;
 use SilverStripe\ORM\Hierarchy\Hierarchy;
 use SilverStripe\ORM\ManyManyList;
+use SilverStripe\ORM\ValidationResult;
 use SilverStripe\ORM\Versioning\Versioned;
 use SilverStripe\Security\Group;
 use SilverStripe\Security\Member;
@@ -1661,12 +1662,13 @@ class SiteTree extends DataObject implements PermissionProvider,i18nEntityProvid
 				? $this->CopyContentFrom()
 				: $this;
 			if(!in_array($subject->ClassName, $allowed)) {
-				$result->error(
+				$result->addError(
 					_t(
 						'SiteTree.PageTypeNotAllowed',
 						'Page type "{type}" not allowed as child of this parent page',
 						array('type' => $subject->i18n_singular_name())
 					),
+					ValidationResult::TYPE_ERROR,
 					'ALLOWED_CHILDREN'
 				);
 			}
@@ -1674,12 +1676,13 @@ class SiteTree extends DataObject implements PermissionProvider,i18nEntityProvid
 
 		// "Can be root" validation
 		if(!$this->stat('can_be_root') && !$this->ParentID) {
-			$result->error(
+			$result->addError(
 				_t(
 					'SiteTree.PageTypNotAllowedOnRoot',
 					'Page type "{type}" is not allowed on the root level',
 					array('type' => $this->i18n_singular_name())
 				),
+				ValidationResult::TYPE_ERROR,
 				'CAN_BE_ROOT'
 			);
 		}
diff --git a/code/Model/VirtualPage.php b/code/Model/VirtualPage.php
index 542a33ce..b8918055 100644
--- a/code/Model/VirtualPage.php
+++ b/code/Model/VirtualPage.php
@@ -7,6 +7,7 @@ use SilverStripe\Forms\LiteralField;
 use SilverStripe\Forms\ReadonlyTransformation;
 use SilverStripe\Forms\TreeDropdownField;
 use SilverStripe\ORM\DataObject;
+use SilverStripe\ORM\ValidationResult;
 use SilverStripe\ORM\Versioning\Versioned;
 use SilverStripe\Security\Member;
 use Page;
@@ -305,12 +306,13 @@ class VirtualPage extends Page {
 		// "Can be root" validation
 		$orig = $this->CopyContentFrom();
 		if($orig && $orig->exists() && !$orig->stat('can_be_root') && !$this->ParentID) {
-			$result->error(
+			$result->addError(
 				_t(
 					'VirtualPage.PageTypNotAllowedOnRoot',
 					'Original page type "{type}" is not allowed on the root level for this virtual page',
 					array('type' => $orig->i18n_singular_name())
 				),
+				ValidationResult::TYPE_ERROR,
 				'CAN_BE_ROOT_VIRTUAL'
 			);
 		}
diff --git a/tests/model/SiteTreeTest.php b/tests/model/SiteTreeTest.php
index b5ae123a..7bc7f19f 100644
--- a/tests/model/SiteTreeTest.php
+++ b/tests/model/SiteTreeTest.php
@@ -1057,27 +1057,27 @@ class SiteTreeTest extends SapphireTest {
 
 		$classB->ParentID = $page->ID;
 		$valid = $classB->doValidate();
-		$this->assertTrue($valid->valid(), "Does allow children on unrestricted parent");
+		$this->assertTrue($valid->isValid(), "Does allow children on unrestricted parent");
 
 		$classB->ParentID = $classA->ID;
 		$valid = $classB->doValidate();
-		$this->assertTrue($valid->valid(), "Does allow child specifically allowed by parent");
+		$this->assertTrue($valid->isValid(), "Does allow child specifically allowed by parent");
 
 		$classC->ParentID = $classA->ID;
 		$valid = $classC->doValidate();
-		$this->assertFalse($valid->valid(), "Doesnt allow child on parents specifically restricting children");
+		$this->assertFalse($valid->isValid(), "Doesnt allow child on parents specifically restricting children");
 
 		$classB->ParentID = $classC->ID;
 		$valid = $classB->doValidate();
-		$this->assertFalse($valid->valid(), "Doesnt allow child on parents disallowing all children");
+		$this->assertFalse($valid->isValid(), "Doesnt allow child on parents disallowing all children");
 
 		$classB->ParentID = $classCext->ID;
 		$valid = $classB->doValidate();
-		$this->assertTrue($valid->valid(), "Extensions of allowed classes are incorrectly reported as invalid");
+		$this->assertTrue($valid->isValid(), "Extensions of allowed classes are incorrectly reported as invalid");
 
 		$classCext->ParentID = $classD->ID;
 		$valid = $classCext->doValidate();
-		$this->assertFalse($valid->valid(), "Doesnt allow child where only parent class is allowed on parent node, and asterisk prefixing is used");
+		$this->assertFalse($valid->isValid(), "Doesnt allow child where only parent class is allowed on parent node, and asterisk prefixing is used");
 	}
 
 	public function testClassDropdown() {
diff --git a/tests/model/VirtualPageTest.php b/tests/model/VirtualPageTest.php
index e5ab8e3e..581e536a 100644
--- a/tests/model/VirtualPageTest.php
+++ b/tests/model/VirtualPageTest.php
@@ -400,11 +400,11 @@ class VirtualPageTest extends FunctionalTest {
 
 		$classBVirtual->ParentID = $classA->ID;
 		$valid = $classBVirtual->doValidate();
-		$this->assertTrue($valid->valid(), "Does allow child linked to virtual page type allowed by parent");
+		$this->assertTrue($valid->isValid(), "Does allow child linked to virtual page type allowed by parent");
 
 		$classCVirtual->ParentID = $classA->ID;
 		$valid = $classCVirtual->doValidate();
-		$this->assertFalse($valid->valid(), "Doesn't allow child linked to virtual page type disallowed by parent");
+		$this->assertFalse($valid->isValid(), "Doesn't allow child linked to virtual page type disallowed by parent");
 	}
 
 	public function testGetVirtualFields() {