It does appear that the user may be lacking some permissions, check that the user has all privileges. The logs you attached don't seem to be related. What version of PHP are you running?
... Oddly, it's now working perfectly fine. I've made literally no changes since I posted, went for lunch, came back, seems fine. Clearly, there's some magic afoot here.
Thanks!
Did you have any errors in ../logs_blesta/ also, from the import?
The first error usually kicks off the others. In this case, it looks like a contact is trying to be created that may not be associated with a client_id. Do you have any contacts in your WHMCS database that have a null client_id? Not associated with a client? If so, this is likely the reason.
I sent you a new trial key via our website chat.
If you purchase an owned license, you can request a free development license for development purposes. If you get a monthly license, we can usually offer a development license as well, but they expire after a few months and can be renewed on request.