The system was unable to mount the file system that was specified because the super block indicates that the file system might be corrupted. This is not an impediment for read-only mounts.
If you do not need to write on this file system, run mount(1M) on it using the -o ro option. Otherwise, do as one of the message continuation lines suggests and run fsck(1M) to correct the file system state and update the super-block.
For more information on using fsck(1M), see the section on checking file system integrity in the System Administration Guide, Volume 1.