Could not load file or assembly 'WebDriver, Version=3.141.0.0, Culture=neutral, PublicKeyToken=null

I am trying to execute code with WebDriver but getting this exception, I do have WebDriver reference, Any thoughts what might be causing this exception

"Error: TAEF: [HRESULT: 0x80131604] A failure occurred while preparing to run tests in class ''. (Failed to create an instance of ''. (Failed to instantiate a managed test class. (System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.IO.FileLoadException: Could not load file or assembly 'WebDriver, Version=3.141.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)"