fail.php

<?php

class ContactPage extends UserDefinedForm {
        static $db = array(
                'CenterLat' => 'Varchar',
                'CenterLng' => 'Varchar',
                'Zoom' => 'Int',
                'MarkerDescription', 'Varchar(200)',
        );

        public function getCMSFields() {
                $fields = parent::getCMSFields();

                $fields->addFieldToTab('Root.Map', CompositeField::create(array(
                        TextField::create('CenterLat', 'Latitude'),
                        TextField::create('CenterLng', 'Longitude'),
                        NumericField::create('Zoom', 'Zoom'),
                        TextField::create('MarkerDescription', 'Description'),
                )));

                return $fields;
        }
}

Trace
ReflectionClass->__construct(MarkerDescription)
Injector.php:843
InjectionCreator->create(MarkerDescription,Array)
Injector.php:486
Injector->instantiate(Array)
Injector.php:790
Injector->get(MarkerDescription,,Array)
Injector.php:827
Injector->createWithArgs(MarkerDescription,Array)
Object.php:106
Object::create(MarkerDescription,0)
Object.php:139
Object::create_from_string(MarkerDescription,0)
Database.php:370
SS_Database->requireTable(ContactPage,Array,Array,,Array,)
DB.php:319
DB::requireTable(ContactPage,Array,Array,,Array,)
DataObject.php:3024
DataObject->requireTable()
DatabaseAdmin.php:214
DatabaseAdmin->doBuild(,1)
DatabaseAdmin.php:103
DatabaseAdmin->build(SS_HTTPRequest)
Controller.php:205
Controller->handleAction(SS_HTTPRequest)
RequestHandler.php:184
RequestHandler->handleRequest(SS_HTTPRequest,DataModel)
Controller.php:153
Controller->handleRequest(SS_HTTPRequest,DataModel)
DevelopmentAdmin.php:145
DevelopmentAdmin->build(SS_HTTPRequest)
RequestHandler.php:184
RequestHandler->handleRequest(SS_HTTPRequest,DataModel)
Controller.php:153
Controller->handleRequest(SS_HTTPRequest,DataModel)
Director.php:296
Director::handleRequest(SS_HTTPRequest,Session,DataModel)
Director.php:119
Director::direct(/dev/build,DataModel)
main.php:126