encounter error while it is installing opam with macport

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Hi,

I wanna install opam for my MacBook Pro (osx10.8.5 mountainlion) with macport. Unfortunately,I get error while it is installing.How could I fix it?Thank you for your help!

yours! here is the message comes from terminal: $ sudo port install opam ---> Computing dependencies for opam ---> Dependencies to be installed: aspcud gringo re2c scons ---> Verifying checksums for re2c Error: org.macports.checksum for port re2c returned: re2c-0.14.3.tar.gz does not exist in /opt/local/var/macports/distfiles/re2c Error: Failed to install re2c Please see the log file for port re2c for details:

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_devel_re2c/re2c/main.log

Error: The following dependencies were not installed: aspcud gringo re2c scons To report a bug, follow the instructions in the guide:

​http://guide.macports.org/#project.tickets

Error: Processing of port opam failed