have added lerna to my project, i have added a package to my server by running this command successfully:

```
 lerna add  @types/express --dev

```

But when I want to add another one:

```
lerna add graphql class-validator type-graphql

```

I got this error :

```
info cli using local version of lerna
lerna notice cli v3.22.1
lerna WARN No packages found where graphql can be added. 

```

1. Is something missed or wrong for adding the packages?
2. Should I use `yarn add` instead of `leran add`? looks it works but I doubt about the packages tree form to be correct