Error: Unable to open port: invalid command name "ui_channels"

[estrnod@…]

I am running OS X 10.4.11 on Powerbook G4. I had the same error above with 'port upgrade outdated' on MacPorts 1.7.0 (having done a successful selfupdate but 'port upgrade outdated' failed. I installed (upgraded to) 1.8.2 over 1.7.0 from a dmg, did another selfupdate, then tried 'port upgrade outdated' but it still failed with the error in the summary above. So I uninstalled all the ports I had and then tried installing openjdk6, which again gave me the above error. I then completely removed the MacPorts installation (using the command on the macports website for uninstalling (rm -rf ...) and reinstalled it, and then retried the openjdk6 install. Here is the text with -d from the most recent openjdk install attempt:

port -d install openjdk6 DEBUG: Found port in ​file:///opt/local/var/macports/sources/rsync.macports.org/release/ports/java/openjdk6 DEBUG: Changing to port directory: /opt/local/var/macports/sources/rsync.macports.org/release/ports/java/openjdk6 DEBUG: invalid command name "ui_channels"

invoked from within

"ui_channels $priority"

(procedure "macports::ui_init" line 4) invoked from within

"macports::ui_init debug {OS Platform: darwin}"

("eval" body line 1) invoked from within

"eval macports::ui_init debug $args "

(procedure "ui_debug" line 1) invoked from within

"ui_debug "OS Platform: [option os.platform]""

(file "/opt/local/share/macports/Tcl/port1.0/portmain.tcl" line 103) invoked from within

"source /opt/local/share/macports/Tcl/port1.0/portmain.tcl"

("package ifneeded" script) invoked from within

"package require portmain 1.0"

(file "/opt/local/share/macports/Tcl/port1.0/port.tcl" line 36) invoked from within

"source /opt/local/share/macports/Tcl/port1.0/port.tcl"

("package ifneeded" script) invoked from within

"package require port $version "

(procedure "PortSystem" line 2) invoked from within

"PortSystem 1.0"

(file "Portfile" line 3) invoked from within

"source Portfile"

invoked from within

"$workername eval source Portfile"

(procedure "mportopen" line 46) invoked from within

"mportopen $porturl [array get options] [array get requested_variations]" Error: Unable to open port: invalid command name "ui_channels" To report a bug, see <​http://guide.macports.org/#project.tickets>