Error getting fromm space for: z:\\: z:\\TV Shows

Warn Core.Providers.RootDirProvider Error getting fromm space for: z:\: z:\TV Shows

Why this error in log?
z:\TV Shows is my path

have you checked if your root path is still correct mine looks like the following

If the root folder is correct as soon as you type for example Z:/ you should then see all the folder names in that direct start to appear

Here is what happens when i type in another one of my drives just using the Drive Letter

NzbDrone is attempting to get the free space for the entire drive (which is what you would expect), instead of reporting the free space for each root folder on the same drive separately, which would be an issue if you had two on the same drive, such as:
C:\\TV Shows 1
C:\\TV Shows 2

Based on that error I couldn’t tell you why its happening, but you should be able to look at the debug logs (File) from System -> Logs -> File in the NzbDrone UI to see additional information, or click on that error in the Log table and see the stack trace for it.