CMake Error at /opt/ros/melodic/share/grid_map_cv/cmake/grid_map_cvConfig.cmake:113 (message): Project 'grid_map_cv' specifies '/usr/include/opencv ' as an include dir

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Trying to build some ROS packages, but keep saying this error. Opencv is installed and it does have the opencv file in the path indicated. I have been trying to solve this issue for so long. Thank you for help!

Errors << ticobot_occupancy_grid:cmake /home/nvidia/catkin_ws/logs/ticobot_occupancy_grid/build.cmake.010.log
CMake Error at /opt/ros/melodic/share/grid_map_cv/cmake/grid_map_cvConfig.cmake:113 (message):
Project 'grid_map_cv' specifies '/usr/include/opencv ' as an include dir,
which is not found. It does neither exist as an absolute directory nor in
'${{prefix}}//usr/include/opencv '. Check the issue tracker
'http://github.com/anybotics/grid_map/issues' and consider creating a
ticket if the problem has not been reported yet.
Call Stack (most recent call first):
/opt/ros/melodic/share/grid_map_ros/cmake/grid_map_rosConfig.cmake:197 (find_package)
/opt/ros/melodic/share/catkin/cmake/catkinConfig.cmake:76 (find_package)
CMakeLists.txt:12 (find_package)