RSpec - problem podczas uruchamiania

RSpec’s reporter has already been initialized with #IO: as the deprecation stream, so >your change to deprecation_stream will be ignored. You should configure it earlier for it to take effect, >or use the
–deprecation-out CLI option.

Ktoś wie cokolwiek na ten temat ?? Błąd pojawia się przy komendzie : rspec spec --format documentation.