Error accessing a folder

I created a new account, & assigned that account an access to a folder, when the user tries to log in, I get the following error,

An error occured:

Attempted to access a path that is not on the disk

how can i resolve this problem?

This is a permissions problem, please first identify the correct user that the application is running in the context of. Edit FileVista\App_Data\FileVista.config and set the value of key IsConfigurationComplete to 0. 
Run configuration.aspx and see the name of current executing user, do not proceed to next pages. 

Then please make sure that the executing user has permissions on the folder in question.