Subject directory not found

Hi, I have a linux virtual machine installed on my pc and I computed all the required things for my inverse solution, including BEM, src, noice covariance matrix. I then exported all the folders into my windows
system. However, when I tried computing inverse solution using,

                 hemi='both',
                 subjects_dir=subjects_dir,
                 time_viewer=True)

it tells me that the subject directory is missing. Why is that so? Is importing the entire folder from another machine(virtual box to windows) causing the problem? If so, how can I solve it?