Saving container layout causes error.

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Hi, Just installed C5 8.5.2. Created my first page, and put a Twitter Bootstrap grid with 4 columns in the page footer. Content is only in the two center columns, and wanted to make the two side columns narrorower. When Edit Container Layout is opened and then saved, get the following error. Is it me or C5? Thanks



Call to a member function render() on null
Details
public/concrete/views/dialogs/block/edit.php(33): Error->null   
public/concrete/src/View/View.php(267): null->include   
public/concrete/src/View/View.php(245): Concrete\Core\View\View->renderInnerContents   
public/concrete/src/View/AbstractView.php(164): Concrete\Core\View\View->renderViewContents   
public/concrete/src/Routing/ControllerRouteAction.php(82): Concrete\Core\View\AbstractView->render   
public/concrete/src/Http/RouteDispatcher.php(37): Concrete\Core\Routing\ControllerRouteAction->execute   
public/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\RouteDispatcher->dispatch   
public/concrete/src/Http/Middleware/MiddlewareStack.php(86): Concrete\Core\Http\Middleware\DispatcherDelegate->next   
public/concrete/src/Http/DefaultDispatcher.php(125): Concrete\Core\Http\Middleware\MiddlewareStack->process   
public/concrete/src/Http/DefaultDispatcher.php(58): Concrete\Core\Http\DefaultDispatcher->handleDispatch   
public/concrete/src/Http/Middleware/DispatcherDelegate.php(39): Concrete\Core\Http\DefaultDispatcher->dispatch   
public/concrete/src/Http/Middleware/ThumbnailMiddleware.php(76): Concrete\Core\Http\Middleware\DispatcherDelegate->next   
public/concrete/src/Http/Middleware/MiddlewareDelegate.php(50): Concrete\Core\Http\Middleware\ThumbnailMiddleware->process