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SQL Server error code

SQL Server error 7905

SQL Server raises error 7905 at severity 16, which marks a problem with the query or data that you can correct.

Database error: The directory "%.*ls" is not a valid FILESTREAM directory in container ID %d.
Msg7905
NameDBCC2_FS_INVALID_ROWSET_DIRECTORY
Severity16
Group7000–7999

What it means

The name of a rowset directory is the partition ID of the partition, except for the special rowset directory names such as 'ghost'. If a rowset directory name cannot be converted to a partition ID, the directory is not a valid rowset directory.

Source: Database Engine events and errors