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Unable to run Gazebo 11 and old project after installation from source

Hi,

I reinstalled Gazebo 11 from source after uninstalling it (which I installed from debians). The earlier version was Gazebo 9. Actually, I need to try DART for running an old project. I followed the 'installation from source' instructions as provided on: http://gazebosim.org/tutorials?tut=install_from_source&cat=install. Also, I installed the gazebo_ROS_pkgs as described on: http://gazebosim.org/tutorials?tut=ros_installing&cat=connect_ros. However, when I am trying to run the same old project after re-installation, I am getting the following errors. Also, when I run just Gazebo, I get the errors as described below in the second box. Please suggest the needful. Please let me know if any more details are required. Thank you.

Error when I run my old project:

Service [/physics/info/plugin] is not valid.
[Err] [World.cc:275] Error advertising service [/physics/info/plugin]
[Wrn] [ODEPhysics.cc:214] Gravity vector is (0, 0, 0). Objects will float.
Service [/introspection/livnqn/filter_new] is not valid.
[Err] [IntrospectionManager.cc:51] Error advertising service [/introspection/livnqn/filter_new]
Service [/introspection/livnqn/filter_update] is not valid.
[Err] [IntrospectionManager.cc:59] Error advertising service [/introspection/livnqn/filter_update]
Service [/introspection/livnqn/filter_remove] is not valid.
[Err] [IntrospectionManager.cc:67] Error advertising service [/introspection/livnqn/filter_remove]
Service [/introspection/livnqn/items] is not valid.
[Err] [IntrospectionManager.cc:75] Error advertising service [/introspection/livnqn/items]
Topic [/introspection/livnqn/items_update] is not valid.
[Err] [IntrospectionManager.cc:85] Error advertising topic [/introspection/livnqn/items_update]
Topic [/mahu03_r013/joint_cmd] is not valid.
[Err] [JointController.cc:51] Error subscribing to topic [/mahu03_r013/joint_cmd]
Service [/mahu03_r013/joint_cmd_req] is not valid.
[Err] [JointController.cc:58] Error advertising service [/mahu03_r013/joint_cmd_req]
[libprotobuf ERROR google/protobuf/descriptor_database.cc:57] File already exists in database: ignition/msgs/time.proto
[libprotobuf FATAL google/protobuf/descriptor.cc:1164] CHECK failed: generated_database_->Add(encoded_file_descriptor, size): 
terminate called after throwing an instance of 'google::protobuf::FatalException'
  what():  CHECK failed: generated_database_->Add(encoded_file_descriptor, size):

Moreover, when I try to run just gazebo, I get the following errors:

Service [/introspection/vwsgsb/filter_new] is not valid.
Service [/introspection/vwsgsb/filter_update] is not valid.
Service [/introspection/vwsgsb/filter_remove] is not valid.
Service [/introspection/vwsgsb/items] is not valid.
Topic [/introspection/vwsgsb/items_update] is not valid.
Service [/marker/list] is not valid.
Service [/marker] is not valid.