Cannot add fingerprintjs-pro-angular with yarn

[Orkuncakilkaya]

When I tried to add fingerprintjs-pro-angular lib on root directory I got this error message

Command: yarn add @fingerprintjs/fingerprintjs-pro-angular

Response:

error Running this command will add the dependency to the workspace root rather than the workspace itself, which might not be what you want - if you really meant it, make it explicit by running this command again with the -W flag (or --ignore-workspace-root-check).
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.

On readme the working directory is not specified. Either -W flag should added to command or working dir should be specified.