-3004: Invalid host file sequence 

Explanation:

This error can occur if you import a backup from various data carriers, one after the other.

The data carrier specified has no content that matches the command specified.

The error message contains an additional error description which must be interpreted according to the operating system being used.

User Response:

To resume the action, specify a suitable data carrier or a suitable backup tool.

See also:

Concepts of the Database System, Backing Up and Restoring