Die vollständige Fehlermeldung:

Uncaught TYPO3 Exception
#1218547409: FoT3\Mediace\Hooks\PageLayoutView\MultimediaPreviewRenderer must 
implement interface TYPO3\CMS\Backend\View\PageLayoutViewDrawItemHookInterface 
(More information)

UnexpectedValueException thrown in file
/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/View/PageLayoutView.php
 in line 1580.

15 TYPO3\CMS\Backend\View\PageLayoutView::tt_content_drawItem(array)

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/View/PageLayoutView.php:
00630:                             );
00631:                             $innerContent = '<div ' . ($row['_ORIG_uid'] ? ' 
class="ver-element"' : '') . '>'
00632:                                 . $this->tt_content_drawItem($row) . 
'</div>';
00633:                             $singleElementHTML .= '<div 
class="t3-page-ce-body-inner">' . $innerContent . '</div>'
00634:                                 . $this->tt_content_drawFooter($row);

14 TYPO3\CMS\Backend\View\PageLayoutView::getTable_tt_content(1)

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/View/PageLayoutView.php:
00254:                     break;
00255:                 case 'tt_content':
00256:                     return $this->getTable_tt_content($id);
00257:                     break;
00258:                 default:

13 TYPO3\CMS\Backend\View\PageLayoutView::getTable("tt_content", 1, "")

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/recordlist/Classes/RecordList/AbstractDatabaseRecordList.php:
00515:             }
00516:             // Finally, render the list:
00517:             $this->HTMLcode .= $this->getTable($tableName, $this->id, 
implode(',', $fields));
00518:         }
00519:     }

12 TYPO3\CMS\Recordlist\RecordList\AbstractDatabaseRecordList::generateList()

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/Controller/PageLayoutController.php:
00970:             $dbList->HTMLcode .= 
$this->moduleTemplate->getVersionSelector($this->id);
00971:             // Generate the list of elements here:
00972:             $dbList->generateList();
00973:             // Adding the list content to the tableOutput variable:
00974:             $tableOutput[$table] = $h_func .  $dbList->HTMLcode . 
$h_func_b;

11 TYPO3\CMS\Backend\Controller\PageLayoutController::renderListContent()

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/Controller/PageLayoutController.php:
00661:                 $content .= '<h1 class="t3js-title-inlineedit">' . 
htmlspecialchars($this->getLocalizedPageTitle()) . '</h1>';
00662:                 // All other listings
00663:                 $content .= $this->renderListContent();
00664:             }
00665:             $content .= '</form>';

10 TYPO3\CMS\Backend\Controller\PageLayoutController::main()

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/Controller/PageLayoutController.php:
00573:         $this->init();
00574:         $this->clearCache();
00575:         $this->main();
00576:         
$response->getBody()->write($this->moduleTemplate->renderContent());
00577:         return $response;

9 
TYPO3\CMS\Backend\Controller\PageLayoutController::mainAction(TYPO3\CMS\Core\Http\ServerRequest,
 TYPO3\CMS\Core\Http\Response)
8 call_user_func_array(array, array)

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/core/Classes/Http/Dispatcher.php:
00039:         $targetIdentifier = $request->getAttribute('target');
00040:         $target = $this->getCallableFromTarget($targetIdentifier);
00041:         return call_user_func_array($target, [$request, $response]);
00042:     }
00043:
7 TYPO3\CMS\Core\Http\Dispatcher::dispatch(TYPO3\CMS\Core\Http\ServerRequest, 
TYPO3\CMS\Core\Http\Response)

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/Http/BackendModuleRequestHandler.php:
00199:             $dispatcher = 
GeneralUtility::makeInstance(Dispatcher::class);
00200:             $this->request = $this->request->withAttribute('target', 
$moduleConfiguration['routeTarget']);
00201:             $response = $dispatcher->dispatch($this->request, $response);
00202:         } else {
00203:             // extbase module

6 
TYPO3\CMS\Backend\Http\BackendModuleRequestHandler::dispatchModule("web_layout")

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/Http/BackendModuleRequestHandler.php:
00090:         $moduleName = (string)$this->request->getQueryParams()['M'];
00091:         if ($this->isDispatchedModule($moduleName)) {
00092:             return $this->dispatchModule($moduleName);
00093:         } else {
00094:             // @deprecated: This else path is deprecated and throws 
deprecations logs at registration time. Can be removed with TYPO3 CMS 8.

5 
TYPO3\CMS\Backend\Http\BackendModuleRequestHandler::handleRequest(TYPO3\CMS\Core\Http\ServerRequest)

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/core/Classes/Core/Bootstrap.php:
00300: 00301: // Execute the command which returns a Response object or NULL
00302:         $this->response = $requestHandler->handleRequest($request);
00303:         return $this;
00304:     }

4 
TYPO3\CMS\Core\Core\Bootstrap::handleRequest(TYPO3\CMS\Core\Http\ServerRequest)

/var/customers/webs/typo3_src-7.6.12/typo3/sysext/backend/Classes/Http/Application.php:
00092:         }
00093: 00094: $this->bootstrap->handleRequest($this->request); 00095: 00096: if ($execute !== null) {

3 TYPO3\CMS\Backend\Http\Application::run()

/var/customers/webs/typo3_src-7.6.12/typo3/index.php:
00018: call_user_func(function () {
00019:     $classLoader = require __DIR__ . '/../vendor/autoload.php';
00020:     (new \TYPO3\CMS\Backend\Http\Application($classLoader))->run();
00021: });

2 {closure}()
1 call_user_func(Closure)

/var/customers/webs/typo3_src-7.6.12/typo3/index.php:
00019:     $classLoader = require __DIR__ . '/../vendor/autoload.php';
00020:     (new \TYPO3\CMS\Backend\Http\Application($classLoader))->run();
00021: });
--
---------------------------------
Paul Klimek
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