Error: Problem while installing py27-markdown

[mirohs (Michael Rohs)]

--->  Computing dependencies for py27-markdown
--->  Fetching archive for py27-markdown
--->  Attempting to fetch py27-markdown-3.0.1_0.darwin_17.noarch.tbz2 from http://lil.fr.packages.macports.org/py27-markdown
--->  Attempting to fetch py27-markdown-3.0.1_0.darwin_17.noarch.tbz2.rmd160 from http://lil.fr.packages.macports.org/py27-markdown
--->  Installing py27-markdown @3.0.1_0
--->  Activating py27-markdown @3.0.1_0
Error: Failed to activate py27-markdown: Image error: /opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/markdown_py already exists and does not belong to a registered port.  Unable to activate port py27-markdown. Use 'port -f activate py27-markdown' to force the activation.
Error: See /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_python_py-markdown/py27-markdown/main.log for details.
Error: Problem while installing py27-markdown
Error: Follow https://guide.macports.org/#project.tickets to report a bug.

[mf2k (Frank Schima)]

In the future, please fill in the Port field and add the port maintainer(s) to Cc (port info --maintainers py27-markdown), if any.

There is nothing to fix here. Since Trac is not for tech support, follow-up on the ​Macports Users mailing list instead.