self update fails on ElCap: Failed to verify signature for MacPorts source

[permezel@…]

Some port failed (can't remember which -- that was days ago, but I think it had something to do with lua and/or wireshark, so I removed and re-installed, and it was still broke).

So today I decided to try and self update. that failed. So I re-downloaded the ElCap version, and reinstalled. Still fails.

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

sent 36 bytes received 69 bytes 42.00 bytes/sec total size is 27013120 speedup is 257267.81 receiving file list ... done

sent 36 bytes received 76 bytes 44.80 bytes/sec total size is 512 speedup is 4.57 Error: Failed to verify signature for MacPorts source! To report a bug, follow the instructions in the guide:

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

Error: /opt/local/bin/port: port selfupdate failed: Failed to verify signature for MacPorts source!