Blastdbcheck Error

I keep getting errors on the following command:

blastdbcheck -db nt.00

Writing messages to <stdout> at verbosity (Summary)
ISAM testing is ENABLED.
Legacy testing is DISABLED.
By default, testing 200 randomly sampled OIDs.

Testing 1 volume(s).
  /home/envdev/data/blast/db/nt.00 / MetaData:   [ERROR] caught exception.
 Result=FAILURE. 1 errors reported in 1 volume(s).
Testing 0 alias(es).
 Result=SUCCESS. No errors reported for 0 alias(es).

Total errors: 1

I downloaded via the update script, checked the md5 checksum, and unzipped the file.

Anyone seen this?

The box has 48 GB of memory.

Thanks!

Matt