activate extension in beta 7

I am unable to activate extension in beta 7. after activating extension the admin pages goes blank

Clear the cache:

How do I run the php flarum cache clear

ebeneebz You need to run that command in the composer.

gurjyot what is the exact command I will put in composer

Looks like the fault of the extension you're enabling

MichaelBelgium it's fresh install

ebeneebz Here's the command.

php flarum cache:clear