OnPostprocessBuild build project path does not exist

Question

I am trying to copy some files into the build directory after completing a build, but the path provided as an argument to OnPostProcessBuild does not exist.

[PostProcessBuildAttribute(1)]
 public static void OnPostprocessBuild(BuildTarget target, string pathToBuildProject)
    {
        if (target.ToString() == "iOS")
        {
            Debug.Log("Build Finished for target : " + target.ToString());
            Debug.Log("Build Finished at Path : " + pathToBuildProject);
            Debug.Log("File pick location : " + objectiveCCodeFilePath);

            //Pasted in the xcode exported build
            xCodeBuildPath = pathToBuildProject + "/Classes";
            Debug.Log("File paste location : " + xCodeBuildPath);
            Debug.Log("System.IO.File.Exists(objectiveCCodeFilePath) : " + System.IO.File.Exists(objectiveCCodeFilePath));
            Debug.Log("Build path without classes : " + System.IO.File.Exists(pathToBuildProject));//return false
            Debug.Log("Build path with classes : " + System.IO.File.Exists(xCodeBuildPath));//return false, but the same path is opening in explorer
            //MonoBehaviour.Invoke("CopyFile",2);
            //StartCoroutine

        }


    }

This is showing false. What I am doing wrong?

 Debug.Log("Build path without classes : " + System.IO.File.Exists(pathToBuildProject));//return false
            Debug.Log("Build path with classes : " + System.IO.File.Exists(xCodeBuildPath));//return false, 

but the same path is opening in explorer