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TypeError: array_keys(): Argument #1 ($array) must be of type array, string given in array_keys() (line 313 of modules/contrib/xls_serialization/src/Encoder/Xls.php).
array_keys('No route found for "GET /en/export/1621"') (Line: 313)
Drupal\xls_serialization\Encoder\Xls->extractHeaders(Array, Array) (Line: 169)
Drupal\xls_serialization\Encoder\Xls->setHeaders(Object, Array, Array) (Line: 75)
Drupal\xls_serialization\Encoder\Xls->encode(Array, 'xlsx', Array) (Line: 40)
Symfony\Component\Serializer\Encoder\ChainEncoder->encode(Array, 'xlsx', Array) (Line: 306)
Symfony\Component\Serializer\Serializer->encode(Array, 'xlsx', Array) (Line: 129)
Symfony\Component\Serializer\Serializer->serialize(Array, 'xlsx') (Line: 77)
Drupal\serialization\EventSubscriber\DefaultExceptionSubscriber->on4xx(Object) (Line: 112)
Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase->onException(Object, 'kernel.exception', Object)
call_user_func(Array, Object, 'kernel.exception', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.exception') (Line: 229)
Symfony\Component\HttpKernel\HttpKernel->handleThrowable(Object, Object, 1) (Line: 92)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 54)
Drupal\simple_oauth\HttpMiddleware\BasicAuthSwap->handle(Object, 1, 1) (Line: 58)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 49)
Asm89\Stack\Cors->handle(Object, 1, 1) (Line: 48)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)