Installing grads using sudo port occurs error

[kimi4896171@…]

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epri12i1:~ epri$ grads -bash: grads: command not found epri12i1:~ epri$ sudo port install grads ---> Computing dependencies for grads ---> Activating grads @2.0.2_7 Error: org.macports.activate for port grads returned: Image error: /opt/local/bin/wgrib already exists and does not belong to a registered port. Unable to activate port grads. Use 'port -f activate grads' to force the activation. Please see the log file for port grads for details:

/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_science_grads/grads/main.log

To report a bug, follow the instructions in the guide:

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

Error: Processing of port grads failed epri12i1:~ epri$ sudo port -f activate grads ---> The following versions of grads are currently installed: ---> grads @2.0.2_6 ---> grads @2.0.2_7 Error: port activate failed: Registry error: Please specify the full version as recorded in the port registry. epri12i1:~ epri$

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there's no grads program so i installed it and it failed :( i tried logout and rebooting whole program but it failed again :(( self upgraded of course but it failed again :((( what should i do? is there any problem that i miss?

i realllllllllyyyyyyyy want your help!