Open Stack

Hello

We are facing an issue with Mistral devstack installation in our gate 
job testing murano-congress-mistral integration (policy enforcement) [1] 
. Mistral devstack scripts are failing with following import error [2]

2015-04-12 14:06:25.236 | Traceback (most recent call last):
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/tools/sync_db.py", line 20, in <module>
2015-04-12 14:06:25.236 |     from mistral.services import action_manager
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/mistral/services/action_manager.py", line 25, in 
<module>
2015-04-12 14:06:25.236 |     from mistral.services import actions
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/mistral/services/actions.py", line 17, in <module>
2015-04-12 14:06:25.236 |     from mistral.workbook import parser as 
spec_parser
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/mistral/workbook/parser.py", line 20, in <module>
2015-04-12 14:06:25.236 |     from mistral.workbook.v2 import actions as 
actions_v2
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/mistral/workbook/v2/actions.py", line 18, in 
<module>
2015-04-12 14:06:25.236 |     from mistral.workbook.v2 import base
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/mistral/workbook/v2/base.py", line 15, in <module>
2015-04-12 14:06:25.236 |     from mistral.workbook import base
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/mistral/workbook/base.py", line 23, in <module>
2015-04-12 14:06:25.236 |     from mistral import expressions as expr
2015-04-12 14:06:25.236 |   File 
"/opt/stack/new/mistral/mistral/expressions.py", line 22, in <module>
2015-04-12 14:06:25.237 |     from yaql.language import exceptions as 
yaql_exc
2015-04-12 14:06:25.237 | ImportError: No module named language


Does anyone know what could be the cause?

[1] 
https://github.com/openstack-infra/project-config/blob/master/jenkins/jobs/murano.yaml#L42
[2] 
http://logs.openstack.org/04/171504/6/check/gate-murano-congress-devstack-dsvm/3b2d7e1/logs/devstacklog.txt.gz

Regards
Filip