[TYPO3-mvc] Cannot object of type QueryResult to string

[TSniper]

Hi List !

Today i have this error message : Cannot cast object of type "TYPO3\CMS\Extbase\Persistence\Generic\QueryResult" to string. 

This is the code on the LocationController:
	public function listAction() {		
		$locations = $this->locationRepository->findByArguments($this->params);
		$this->view->assign('locations', $locations);
	}

And this is the code in the view : 
<n:widget.paginate objects="{locations}" as="paginatedlocation" configuration="{settings.list.paginate}">
          <f:for each="{paginatedlocation}" as="location">

              /// content here*

          </f:for>
        </n:widget.paginate>

I'm missing something here?
Thanks for any help