Date fiels causing trouble

Can anybody explain to me what this error means and how to corres´ct it ??

best regards

Stig

Sorry forgot the message:

Error:
Object of class DateTime could not be converted to string

  at views/Events22Edit.php:111
  at include()
     (src/PhpRenderer.php:211)
  at PHPMaker2026\Hus3\PhpRenderer->protectedIncludeScope('views/Events22Edit.php', array('Page' => object(Events22Edit), 'Title' => null, 'Language' => object(Language), 'Security' => object(AdvancedSecurity), 'TokenNameKey' => '_csrf_id', 'TokenName' => 'submit', 'TokenValueKey' => '_csrf_token', 'TokenValue' => 'csrf-token', 'DashboardReport' => null, 'SkipHeaderFooter' => false, 'Nonce' => '611v3Ul4UpteN39w/UCO1+ri'))
     (src/PhpRenderer.php:177)
  at PHPMaker2026\Hus3\PhpRenderer->fetchTemplate('Events22Edit.php', array('Page' => object(Events22Edit), 'Title' => null, 'Language' => object(Language), 'Security' => object(AdvancedSecurity), 'TokenNameKey' => '_csrf_id', 'TokenName' => 'submit', 'TokenValueKey' => '_csrf_token', 'TokenValue' => 'csrf-token', 'DashboardReport' => null, 'SkipHeaderFooter' => false, 'Nonce' => '611v3Ul4UpteN39w/UCO1+ri'))
     (src/PhpRenderer.php:148)
  at PHPMaker2026\Hus3\PhpRenderer->fetch('Events22Edit.php', array(), true)
     (src/PhpRenderer.php:51)
  at PHPMaker2026\Hus3\PhpRenderer->render(object(Response), 'Events22Edit.php')
     (src/BaseController.php:387)
  at PHPMaker2026\Hus3\BaseController->runPage(object(Events22Edit))
     (controllers/Events22Controller.php:103)
  at PHPMaker2026\Hus3\Events22Controller->edit(object(Request), object(Events22Edit), object(_Event))
     (vendor/symfony/http-kernel/HttpKernel.php:195)
  at Symfony\Component\HttpKernel\HttpKernel->handleRaw(object(Request), 1)
     (vendor/symfony/http-kernel/HttpKernel.php:77)
  at Symfony\Component\HttpKernel\HttpKernel->handle(object(Request), 1, true)
     (vendor/symfony/http-kernel/Kernel.php:205)
  at Symfony\Component\HttpKernel\Kernel->handle(object(Request))
     (vendor/symfony/runtime/Runner/Symfony/HttpKernelRunner.php:34)
  at Symfony\Component\Runtime\Runner\Symfony\HttpKernelRunner->run()
     (vendor/autoload_runtime.php:32)
  at require_once('/var/www/bogknold.dk/public_html/hus3/vendor/autoload_runtime.php')
     (index.php/:8)