相关疑难解决方法(0)

在Haskell模块中评估"import Control.Monad.State"行时,GHC给出了以下错误:

Could not find module `Control.Monad.State':
  it was found in multiple packages: monads-fd-0.0.0.1 mtl-1.1.0.2
Failed, modules loaded: none.

Run Code Online (Sandbox Code Playgroud)

我该如何解决这个冲突？