MacOS – Installing MacPorts on Snow Leopard

I installed MacPorts from the DMG package at http://www.macports.org/install.php

After installing it I tried to use it and get this:

dlopen(/opt/local/share/macports/Tcl/macports1.0/MacPorts.dylib, 10): no suitable image found.  Did find:
    /opt/local/share/macports/Tcl/macports1.0/MacPorts.dylib: no matching architecture in universal wrapper
    while executing
"load /opt/local/share/macports/Tcl/macports1.0/MacPorts.dylib"
    ("package ifneeded macports 1.0" script)
    invoked from within
"package require macports"
    (file "/opt/local/bin/port" line 39)

I tried removing /opt/local/share/macports and /opt/local/bin/port and reinstalling, but it did not help.

Update:

I tried a complete removal by doing

%% sudo rm -rf \
    /opt/local \
    /Applications/DarwinPorts \
    /Applications/MacPorts \
    /Library/LaunchDaemons/org.macports.* \
    /Library/Receipts/DarwinPorts*.pkg \
    /Library/Receipts/MacPorts*.pkg \
    /Library/StartupItems/DarwinPortsStartup \
    /Library/Tcl/darwinports1.0 \
    /Library/Tcl/macports1.0 \
    ~/.macports

And then installing MacPorts-1.9.2-10.6-SnowLeopard.dmg but still I get same error.