keep getting catkin cannot build a non-homogeneous workspace without isolation after running CMake(onROS noetic)

[passafer]

traversing 20 packages in topological order:
-- ~~ - cartographer (plain cmake)
-- ~~ - otter_slam
-- ~~ - nmea_navsat_driver
-- ~~ - cartographer_ros_msgs
-- ~~ - usv_msgs
-- ~~ - mr_obs_connector
-- ~~ - rplidar_ros
-- ~~ - coverage_boustrophedon
-- ~~ - coverage_binn
-- ~~ - guidance
-- ~~ - otter_control
-- ~~ - cartographer_ros
-- ~~ - cartographer_rviz
-- ~~ - usv_gazebo_plugins
-- ~~ - otter_description
-- ~~ - otter_gazebo
-- ~~ - usv_worlds
-- ~~ - xsens_driver
-- ~~ - map_inflating
-- ~~ - sensors
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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/ubuntu/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ubuntu/catkin_ws/build/CMakeFiles/CMakeError.log".
Invoking "cmake" failed

[jhlenes]

I think this is because you have cartographer in your workspace.

As I say here, I recommend building cartographer in its own workspace, and then overlaying the workspace containing the complete_coverage package. See http://wiki.ros.org/catkin/Tutorials/workspace_overlaying

For example, you can build and install cartographer in ~/cartographer_ws. Then you should be able to build the complete_coverage package in ~/catkin_ws if you first source ~/cartographer_ws/install_isolated/setup.bash

[passafer]

i built cartographer in cartographer_ws
sourced ~/cartographer_ws/install_isolated/setup.bash
now i started getting this after catkin_make
Invoking "make -j8 -l8" failed
some help please

[passafer]

can you please send me an email ,i am doing a project using your code and i really need your help
passafer25@gmail.com