Error installing robot_localization package: plain cmake error

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ROS Noetic, Ubuntu 20.04

I want to use Robot_localization package with RTABMAP to get odometry data - Sensor fusion (Visual Odom + IMU odom). I am trying to install the robot_localization package by cloning git repo in src folder and doing catkin_make in the ros_workspace, but I am getting this error. I also tried running rosdep install robot_localization but this also raises an error: Error in rosdep

ERROR: the following packages/stacks could not have their rosdep keys resolved
to system dependencies:
robot_localization: Cannot locate rosdep definition for [launch_testing_ament_cmake]

Error in catkin_make:

-- ~~  traversing 2 packages in topological order:
-- ~~  - robot_localization (plain cmake)
-- ~~  - rtabmap_ros
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
CMake Error at /opt/ros/noetic/share/catkin/cmake/catkin_workspace.cmake:100 (message):
  This workspace contains non-catkin packages in it, and catkin cannot build
  a non-homogeneous workspace without isolation.  Try the
  'catkin_make_isolated' command instead.
Call Stack (most recent call first):
  CMakeLists.txt:69 (catkin_workspace)


-- Configuring incomplete, errors occurred!
See also "/home/divi/ros_workspace/eece5554/GROUP_PRJ/build/CMakeFiles/CMakeOutput.log".
See also "/home/divi/ros_workspace/eece5554/GROUP_PRJ/build/CMakeFiles/CMakeError.log".
make: *** [Makefile:3260: cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed