Internal Error While Clicking Docs

Hi everyone.

I am using NC with Collabora code and it works perfectly. But unfortunaly i am trying to stop and remove old image and tried again with new image. After that i am getting this error.

Internal Server Error
The server encountered an internal error and was unable to complete your request.
Please contact the server administrator if this error reappears multiple times, please include the technical details below in your report.
More details can be found in the server log.

Technical details
Remote Address: 202.170.207.115
Request ID: qvnqAkvcNQgDCZq4ePtv

This is my Error Log

Error richdocuments GuzzleHttp\Exception\ConnectException: cURL error 6: Could not resolve host: office.nextcloud.com
/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RequestFsm.php - line 103: GuzzleHttp\Exception\RequestException wrapException(Object(GuzzleHttp\Message\Request), Object(GuzzleHttp\Ring\Exception\ConnectException))
/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RequestFsm.php - line 132: GuzzleHttp\RequestFsm->__invoke(Object(GuzzleHttp\Transaction))
/var/www/html/nextcloud/3rdparty/react/promise/src/FulfilledPromise.php - line 25: GuzzleHttp\RequestFsm->GuzzleHttp{closure}(Array)
/var/www/html/nextcloud/3rdparty/guzzlehttp/ringphp/src/Future/CompletedFutureValue.php - line 55: React\Promise\FulfilledPromise->then(Object(Closure), NULL, NULL)
/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Message/FutureResponse.php - line 43: GuzzleHttp\Ring\Future\CompletedFutureValue->then(Object(Closure), NULL, NULL)
/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/RequestFsm.php - line 134: GuzzleHttp\Message\FutureResponse proxy(Object(GuzzleHttp\Ring\Future\CompletedFutureArray), Object(Closure))
/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php - line 165: GuzzleHttp\RequestFsm->__invoke(Object(GuzzleHttp\Transaction))
/var/www/html/nextcloud/3rdparty/guzzlehttp/guzzle/src/Client.php - line 125: GuzzleHttp\Client->send(Object(GuzzleHttp\Message\Request))
/var/www/html/nextcloud/lib/private/Http/Client/Client.php - line 138: GuzzleHttp\Client->get(‘https //office…’, Array)
/var/www/html/nextcloud/apps/richdocuments/lib/WOPI/DiscoveryManager.php - line 84: OC\Http\Client\Client->get(‘https //office…’)
/var/www/html/nextcloud/apps/richdocuments/lib/WOPI/Parser.php - line 41: OCA\Richdocuments\WOPI\DiscoveryManager->get()
/var/www/html/nextcloud/apps/richdocuments/lib/TokenManager.php - line 117: OCA\Richdocuments\WOPI\Parser->getUrlSrc(‘application/vnd…’)
/var/www/html/nextcloud/apps/richdocuments/lib/Controller/DocumentController.php - line 168: OCA\Richdocuments\TokenManager->getToken(*** sensitive parameters replaced ***)
[internal function] OCA\Richdocuments\Controller\DocumentController->index(‘16’)
/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 160: call_user_func_array(Array, Array)
/var/www/html/nextcloud/lib/private/AppFramework/Http/Dispatcher.php - line 90: OC\AppFramework\Http\Dispatcher->executeController(Object(OCA\Richdocuments\Controller\DocumentController), ‘index’)
/var/www/html/nextcloud/lib/private/AppFramework/App.php - line 114: OC\AppFramework\Http\Dispatcher->dispatch(Object(OCA\Richdocuments\Controller\DocumentController), ‘index’)
/var/www/html/nextcloud/lib/private/AppFramework/Routing/RouteActionHandler.php - line 47: OC\AppFramework\App main(‘OCA\Richdocumen…’, ‘index’, Object(OC\AppFramework\DependencyInjection\DIContainer), Array)
[internal function] OC\AppFramework\Routing\RouteActionHandler->__invoke(Array)
/var/www/html/nextcloud/lib/private/Route/Router.php - line 299: call_user_func(Object(OC\AppFramework\Routing\RouteActionHandler), Array)
/var/www/html/nextcloud/lib/base.php - line 1004: OC\Route\Router->match(’/apps/richdocum…’)
/var/www/html/nextcloud/index.php - line 48: OC handleRequest()
{main}

Thanks In Advance.