/base_scan observation buffer has not been updated [closed]

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Hi,

i am trying to get the navigation stack running. Hokuyo is the laser scanner i am using. When i am launching move_base_local.launch i receive the warning

"The /base_scan observation buffer has not been updated for XX.XX seconds, and it should be updated every 0.20 seconds."

My launch file is: <launch>

<param name="T" type="double" value="0.2"/>
<param name="dt" type="double" value="0.1"/>

<node pkg="youbot_navigation_common" type="lowpass_filter" respawn="false" name="lowpass_filter" output="screen">

</node>

<!-- for moving -->
<node pkg="move_base" type="move_base" respawn="false" name="move_base_node" output="screen">
    <!-- Load common configuration files -->
<remap from="cmd_vel" to="move_base/cmd_vel"/> 
    <rosparam file="$(find youbot_navigation_common)/config/move_base_params.yaml" command="load" />
    <rosparam file="$(find youbot_navigation_common)/config/costmap_common_params.yaml" command="load" ns="global_costmap" />
    <rosparam file="$(find youbot_navigation_common)/config/costmap_common_params.yaml" command="load" ns="local_costmap" />
    <!--<rosparam file="$(find youbot_navigation)/navigation_common/base_local_planner_params.yaml" command="load" ns="TrajectoryPlannerROS" />-->

    <!-- Load global navigation specific parameters -->
    <!--<rosparam file="$(find youbot_navigation)/navigation_local/config/move_base_params.yaml" command="load" />-->
    <rosparam file="$(find youbot_navigation_local)/config/local_costmap_params.yaml" command="load" />
    <rosparam file="$(find youbot_navigation_local)/config/global_costmap_params.yaml" command="load" />
    <rosparam file="$(find youbot_navigation_common)/config/base_local_planner_params.yaml" command="load" />
</node>

</launch>

My local_costmap_params.yaml is:

local_costmap:
publish_voxel_map: true
global_frame: odom
robot_base_frame: base_footprint
update_frequency: 5.0
publish_frequency: 2.0
static_map: false
rolling_window: true
width: 10.0
height: 10.0
resolution: 0.05
origin_x: 0.0
origin_y: 0.0

My global_costmap is:

global_costmap:
publish_voxel_map: true
global_frame: odom
robot_base_frame: base_footprint
update_frequency: 5.0
publish_frequency: 2.0
static_map: false
rolling_window: true
width: 20.0
height: 20.0
resolution: 0.05
origin_x: 0.0
origin_y: 0.0

My costmap_common_params.yaml is this:

map_type: costmap
transform_tolerance: 0.2
obstacle_range: 2.5
raytrace_range: 3.0
inflation_radius: 0.25

observation_sources: base_scan

#base_scan_marking: {sensor_frame: base_scan_link,
#                    data_type: PointCloud2,
#                    topic: /base_scan/marking,
#                    expected_update_rate: 0.2,
#                    observation_persistence: 0.0,
#                    marking: true,
#                    clearing: false,
#                    min_obstacle_height: 0.06,
#                    max_obstacle_height: 2.0}

base_scan: {sensor_frame: base_laser_front_link,
        data_type: LaserScan,
        topic: /base_scan,
        expected_update_rate: 0.2,
        observation_persistence: 0.0,
        marking: true,
        clearing: true,
        min_obstacle_height: -0.10,
        max_obstacle_height: 2.0}

What am i missing or doing wrong? Cannot figure it out myself and couldn't find any proper answers online.

Thanks a lot.