I can not access to the Fab in E.launcher.

Hi I am struggling with Fab. If I run Fab the normal way (in the left panel) it shows: We couldn’t find the page, but if I want to access to Fab from some place in Unrealengine it suddenly become flicking between the black screen and the Fab page. I specify I have install Fab plugin from the Uneral page. Does anyone know how to fix this?