Devel Module

What's going on with the Devel module? I frequently get the following: (In this case I was executing dpm($variables); in a theme_preprocess_menu function but this happens in other situations too.)

The website encountered an unexpected error. Please try again later.
Error: Class "Doctrine\Common\Util\Debug" not found in Drupal\devel\Plugin\Devel\Dumper\DoctrineDebug->export() (line 25 of modules/contrib/devel/src/Plugin/Devel/Dumper/DoctrineDebug.php). 

Drupal\devel\Plugin\Devel\Dumper\DoctrineDebug->export() (Line: 86)
Drupal\devel\DevelDumperManager->export() (Line: 96)
Drupal\devel\DevelDumperManager->message() (Line: 496)
dpm() (Line: 44)
bnc_barrio_preprocess_menu() (Line: 287)
Drupal\Core\Theme\ThemeManager->render() (Line: 436)
Drupal\Core\Render\Renderer->doRender() (Line: 201)
Drupal\Core\Render\Renderer->render() (Line: 157)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 578)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 158)
Drupal\Core\Render\Renderer->renderPlain() (Line: 115)
Drupal\toolbar\Controller\ToolbarController::preRenderGetRenderedSubtrees()
call_user_func_array() (Line: 101)
Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 786)
Drupal\Core\Render\Renderer->doCallback() (Line: 377)
Drupal\Core\Render\Renderer->doRender() (Line: 201)
Drupal\Core\Render\Renderer->render() (Line: 157)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 578)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 158)
Drupal\Core\Render\Renderer->renderPlain() (Line: 278)
toolbar_get_rendered_subtrees() (Line: 289)
_toolbar_get_subtrees_hash() (Line: 167)
toolbar_toolbar()