libxml2 checksum failed

I am trying to install libxml2 using macport 1.6 and get the following errors:---> Fetching libxml2 ---> Verifying checksum(s) for libxml2 Error: Checksum (md5) mismatch for libxml2-2.6.30.tar.gz Error: Checksum (sha1) mismatch for libxml2-2.6.30.tar.gz Error: Checksum (rmd160) mismatch for libxml2-2.6.30.tar.gz Error: Target org.macports.checksum returned: Unable to verify file checksums Error: Status 1 encountered during processing. I have tried to remove the downloaded file and start over -- that has lead to other issues. How do I remove a port and start over? Thanks Michael