I would suspect that you do not have correct permissions to read the file.
In order to confirm that, first check that the file exist. Then check the file permissions. Then check the user mapping.
If that proves to be the root cause, then just make sure that you set the user mapping that will allow you to read/write the file.
Vivek, is this still an issue for you?
Yes it is still an issue.
There is no problem with the permissions on the server.
Please open a ticket with Support if no one here is able to assist you with this.