failed synchro with selfupdate using svn version

[leclercfl@…]

macports was installed according to the section 2.3.3 (subversion install); after modifying the configuration file (/opt/local/etc/macports/sources.conf) the following command is issued and a synchronization error is obtained.

% sudo port -v selfupdate ---> Updating MacPorts base sources using rsync receiving file list ... done

sent 36 bytes received 69 bytes 23.33 bytes/sec total size is 4925440 speedup is 46908.95 receiving file list ... done

sent 36 bytes received 76 bytes 32.00 bytes/sec total size is 512 speedup is 4.57 MacPorts base version 2.2.99 installed, MacPorts base version 2.2.0 downloaded. ---> Updating the ports tree Synchronizing local ports tree from ​file:///opt/mports/trunk/dports svn: OPTIONS of '​https://svn.macports.org/repository/macports/trunk': Server certificate verification failed: issuer is not trusted (​https://svn.macports.org) Command failed: /usr/bin/svn update --non-interactive /Volumes/Ports/opt/mports/trunk/dports Exit code: 1 Error: Synchronization of the local ports tree failed doing an svn update Error: Couldn't sync the ports tree: Synchronization of 1 source(s) failed To report a bug, follow the instructions in the guide:

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

Error: /opt/local/bin/port: port selfupdate failed: Couldn't sync the ports tree: Synchronization of 1 source(s) failed