BLASTN Error: NCBI C++ Exception

Ran into this error today morning.

Error: NCBI C++ Exception:
    T0 "/home/coremake/release_build/build/PrepareRelease_Linux64-Centos_JSID_01_380670_130.14.18.6_9008__PrepareRelease_Linux64-Centos_1508370803/c++/compilers/unix/../../src/serial/objistrasnb.cpp", line 179: Error: ncbi::CObjectIStreamAsnBinary::UnexpectedTagClassByte() - byte 0: unexpected tag: application/constructed/11 (107), should be constructed/None (32) ( at Blast-def-line-set[])

Found that incomplete or corrupted database causes this problem. I had two copies of the same NT database, so I ran md5sum for each of the file in the database and found the md5sum of one of the file was not same. (see below)

 
the long string above is md5sum,file name. - Note the md5sums of the same file are not same.

So just copied the nt.00.nhr file from the archive and blast worked without trouble. If not, you have to download the database again or run makeblastdb again on the fasta sequences.