Checksum (md5) mismatch for db46 patch.4.6.21.3

[sri@…]

$ sudo port install db46 ---> Fetching db46 ---> Attempting to fetch db-4.6.21.tar.gz from ​http://distfiles.macports.org/db4 ---> Verifying checksum(s) for db46 Error: Checksum (md5) mismatch for patch.4.6.21.3 Error: Target org.macports.checksum returned: Unable to verify file checksums Error: Status 1 encountered during processing.

Tried this as told in faq -

sudo port clean --all db46 ---> Cleaning db46 Warning: Distfiles directory '/opt/local/var/macports/distfiles/db4' may contain distfiles needed for other ports, use the -f flag to force removal

Please can anyone help.