Error starting IS

Hi,

When I start the IS i get the following error:

Errors:
wm.ruleservice:startup
wm.ruleservice:startup
com.wm.app.b2b.server.ServiceException: java.sql.SQLException: conn null
Caused by: com.wm.app.b2b.server.ServiceException: java.sql.SQLException: conn null
Caused by: java.sql.SQLException: conn null

Log:
2015-02-27 11:16:08 GMT [ISS.0028.0013E] Startup service exited with the following error: com.wm.app.b2b.server.ServiceException: com.wm.app.b2b.server.ServiceException: java.sql.SQLException: conn null
2015-02-27 11:16:08 GMT [ISU.0000.9999D] InfraDC: Service Error Event wm.ruleservice:startup

What conn is it refering to?
How can I solve this error?
Does this error makes the deployment from blaze 7.1 fail?

Thank you