Errors when trying to run migrations

One more related thing that doesn't work as expected:
1. Getting the previous error
2. Refreshing the Migrate page, seeing the error-giving process which is stuck in the status "Importing"
3. Trying to "Stop" it
4. The status just changes to "Stopping", and gets stuck on that instead. It won't go back to "Idle" unless doing a reset for it.

More related erroneous behavior:

When the error comes, it says "Please continue to the error page", which is a link to the basic Migrate page (admin/content/migrate). There I can see, that there is a blue link "1" below "Messages", relating to the erroneous migration.

When I click on the link, it gives an empty view "No messages". This number or nonexistent messages hasn't so far increased when reproducing the error, nor decreased to zero when resetting.

The server settings also got troubleshooted, so that the "migrate.com" domain was added to its host file in addition to my local hosts file, and all processes were killed from there just in case, but nothing changed.

Thanks for the help, but didn't do the trick for me. :( I can't get the migration even started, and the statuses in the database correlate to what I see on the Migration UI page. Before I start, it's 0 and idle, when I start, it gives that error and goes to 1. Basically resetting it from the database seems to be the same as resetting it from the UI... but the problem persists.

I also tried to uninstall and reinstall the module, no help. Had some erroneous-looking tables there from my older tests (e.g. "migrate_map_" and "migrate_message_"), which disappeared, but everything else is the same.

Yes, of course, that's what I did. :) All the rows in that table have status as 0, but still I get that error immediately before any importing happens. So it has to be something else than what your problem was.

Thanks for the tip, I didn't have that second paragraph of yours at all. It worked immediately through Drush, with no errors!

However, there is some bug in the UI, since it still doesn't work too well from there. First of all, the error message changed here in between without ANY obvious reason or change in the code. Now it is like follows (same error comes when rollbacking):
An AJAX HTTP error occurred. HTTP Result Code: 200 Debugging information follows. Path: http://migrate.com/batch?id=462&op=do StatusText: OK ResponseText: 0{"status":true,"percentage":"100","message":"Processed 1 (1 created, 0 updated, 0 failed, 0 ignored) in 0.2 sec (301\/min) - done with 'Article'\u003cbr \/\u003e"}

When I go to the Migrate page after this error, it gives a nice green Drupal message:
Processed 1 (1 created, 0 updated, 0 failed, 0 ignored) in 0.2 sec (301/min) - done with 'Article'

The end result between using Drush and UI is now the same: Unlike earlier today, I get my test node imported with an error or not, even though I changed nothing in between. Will return to you if I get more helpful error reports later in the process... always so wonderful when stuff happens on itself.

A big thank you in any case! :)