An exception has been thrown during the rendering of a template ("Unable to generate a URL for the named route "" as such route does not exist.").

I've been trying to install the adminLTE templateinto my symfony project but i have encountred several problems.

First, I was using the 1.3 version of adminLTE, I followed the documentation (https://github.com/avanzu/AdminThemeBundle) step by step and when I tried to launch the server to see of it did work i got the following error : Unable to find template "AvanzuAdminThemeBundle:layout:default-layout.html.twig"
Second, I tried to see the previous issues that were open for the same reason and I tried to do as instructed in the different comments : i launched these two commands _( npm install uglify-js -g and npm install uglifycss -g )_ and still had the same problem
Then i decided to swithch branch and try to install the dev-master, and again I did as instructed in the doc but when I tried to use the layout I got this error : An exception has been thrown during the rendering of a template ("Unable to generate a URL for the named route "" as such route does not exist.") It also says that there's a : _Twig_ErrorRuntime in vendor\avanzu\admin-theme-bundle\Resources\views\layout\default-layout.html.twig (line 42) line 42 : __

I followed the documentation still I'm not able to install the template, I don't know where the problem is, can you please help ?

avanzu / AdminThemeBundle