[Resolved] Import translation problems

Background of the issue:
I am trying to import a translation from rws.com into our dev site at hidden link, which is htaccess password protected. We have added rws.com (RWS Language Cloud TMS) as a translator and sent the frontpage for translation. I have uploaded the error log here: hidden link.

Symptoms:
When the translation is done and I press import, I get the message: "Import failed! The translation job (7) doesn´t belong to you." I have tried to reinstall WPML with another key, but I get the same error every time. The latest site key used is EUIosp8d1T. We have done 7 other sites without any problems, but we can´t figure out why we get this error message on this one dev site.

Questions:
Why does the import fail with the message that the translation job doesn't belong to me?
How can I successfully import the translation like on the other 7 sites?