Failed to load plugin (gazebo-11)

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Hello, I am using ROS2 Foxy (built from source) and gazebo11 (installed by command sudo apt install ros-foxy-gazebo-ros-pkgs) on Ubuntu 20.04.1. When I try to follow the test from installing tutorial (http://gazebosim.org/tutorials?tut=ro...) I get an error:

[Err] [Plugin.hh:178] Failed to load plugin libgazebo_ros_diff_drive.so: libgazebo_ros_diff_drive.so: cannot open shared object file: No such file or directory

on the step:

gazebo --verbose /opt/ros/eloquent/share/gazebo_plugins/worlds/gazebo_ros_diff_drive_demo.world

I already cheeked GAZEBO_PLUGIN_PATH, it point directly to the folder where the .so file is located.

Thanks for helping.