I have more than 10 layers from which I have created a layer group. Also I created a style with MBStyle format which contains the symbol for all the layers. The style should be valid since it has been in the web admin panel.
Then I associate each layer to this style in the layer group edit page. However when I preview this layer group, I got 500 error.
For a single layer, when I set the the default style to the style I created, I got 500 error too.
Do I miss anything?