md5 error while saving planning scene/state from RVIZ to MongodBdatabase

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I am using Ubuntu 16.04 with ROS kinetic. I want to create a planning scene in moveit to benchmark planners for my ur3 robot.

1. I have followed these instructions to install MongoDB.

2. I also installed the warehouse_ros_mongo gollowing these instructions

3. After this I am able to start the Mongod server using the following command:

   sudo service mongod start

4. I checked the status of the mongod server using the command

   sudo service mongod status

5. The database was active and running and no errors.

6. Then I launched the moveit config file

   roslaunch ur3_robot_moveit_config demo.launch db:=true

7. And I pressed the connect button under the Warehouse tab and the database got connected. But I got an error in the terminal stating that

   [ERROR] [1574822528.518171355]: backgroundJob already running: PeriodicTaskRunner

8. Next I loaded an object into the planning scene and I pressed Save scene button in the stored scenes tab. But I got an error:

   [ERROR] [1574822372.069618242]: filemd5 failed

9. I also tried saving states but received the same error.

   [ERROR] [1574822534.819973607]: Cannot save robot state on the database: filemd5 failed

How to fix this error ? If anyone have come across this issue before , kindly suggest some solution to fix this !