Unable to resolve custom scheme on nuxt start?

i am following this guide to add custom scheme
https://auth.nuxtjs.org/guide/scheme

nuxt.config.js
```
  auth: {
    strategies: {
      customStrategy: {
        scheme: '~/schemes/customScheme',
...
```

but when I run nuxt build and start, it return error
```
Error: Cannot resolve "~/schemes/customScheme" from "/src/pj/schemes/customScheme"
```