Errors while coping data between shares or data from share to local machine.

You may want to verify the overall path to the file or folder that you are copying is actually within the limiation of 255 characters or less. If it's more than 255 characters, you may want to rename some of it's parent folder to make it within 255 characters.

The path is this in many cases.

\\machine name\Folder name\Folder Name1\Files