The answer can be found here :

~openerp-dev/openobject-addons/7.0-opw-587217-mma/+merge/152145

as my karma is not yet enough for me to post link so i believe you can do a search on the text above.

and if you do not know how , then this is the step but you have do it if you apply upgrade of the module until you get the code patched as the launchpad.

• step 1. go to menu(more->setting->Technical->user interface->view

• step 2. look for "phase.task.search.form" , click Form view

• step 3. click Edit , then at

    <field name="phase_id"/>
    then add domain="[]" so to become 
    <field name="phase_id" domain="[]"/>
  

• step 4. click save and you error should by now solve.

HTH

kalmen.