Moveit Path Constraint Failure

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I'm using the moveit_commander interface on the Fetch robot and trying to add a path constraint. Here's some example code:

    constraints = Constraints()
    oc = OrientationConstraint()
    oc.link_name = "wrist_roll_link"
    oc.header.frame_id = "base_link"
    oc.weight = 1.0
    oc.orientation = orientation #current wrist_roll_link orientation
    oc.absolute_x_axis_tolerance = 3.14
    oc.absolute_y_axis_tolerance = 3.14
    oc.absolute_z_axis_tolerance = 3.14
    constraints.orientation_constraints.append(oc)
    move_group.set_path_constraints(constraints)

Moveit still finds a plan, but the plan is seems to ignore the constraints and outputs an error that says:

/move_group GetPositionIK:1025: 0 is < negative number >

The results are the same for position and orientation constraints. The same code seemed to work in the past. Any ideas would be welcome!

-Sarah