Could not load @nuxtjs/sitemap. Is it installed?

I have started a new fresh project, install

@nuxtjs/sitemap

@nuxtjs/sitemap

add it to

nuxt.config.ts

nuxt.config.ts

modules and then, when I start my application I have this error.

ERROR  Cannot start nuxt:  Could not load @nuxtjs/sitemap. Is it installed?

ERROR  Cannot start nuxt:  Could not load @nuxtjs/sitemap. Is it installed?

Could not load @nuxtjs/sitemap. Is it installed? - Nuxt