help on restore

[Comer Duncan]

I've followed the steps on the macports page
https://trac.macports.org/wiki/Migration under Reinstall Ports.  When I
execute sudo ./restore_ports.tcl myports.txt after a few seconds I get the
output:

ComerMacProRetina:~ comerduncan$ sudo ./restore_ports.tcl myports.txt
Password:
Warning: No default port source specified in
/opt/local/etc/macports/sources.conf, using last source as default
Error: we appear to be stuck, exiting...
infinite loop
    while executing
"sort_ports $portList"
    invoked from within
"set operationList [sort_ports $portList]"
    (file "./restore_ports.tcl" line 285)

Can someone please advise on what to do next to find out what is wrong?
I'm migrating to Mohave from High Sierra.

Thanks very much!

Comer
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