Plannify timebox in Project results in error

1)
-Go to Project/Configuration/GTD/Timeboxes.
-Select a timebox and click on More/Plannify Timebox.
-Set 'Get from Timebox to 'Long Term' and 'Set to Timebox' to 'This week'.
-Click on 'Add an item'

2) Error caused with description:

 "File "/home/odoo/runbot/static/openerp-dev-trunk-30978/server/openerp/osv/expression.py", line 809, in parse
    raise ValueError("Invalid field %r in leaf %r" % (left, str(leaf)))
ValueError: Invalid field 'state' in leaf "<osv.ExtendedLeaf: ('state', '=', 'open') on project_task (ctx: )>"

3)I expected to see a list of tasks with Timebox 'Long Term' that could be selected and added to Timebox 'This Week'

4) Tested on runbot with trunk build 30978 from Safari 5.1.7 on Mac OSX 10.7.4 and recent trunk nightly in Ubuntu Server 12.04 using Safari 5.1.7 on Mac OSX 10.7.4

5) build 30978 on runbot and Version 8.0dev-20140407-230101 nightly

Thanks,

Bill.