Cannot find the header file (msg)

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Hi,

I have a custom built rosmsg but for some reason, I cannot include its header as my IDE cannot locate it. Here is my CMakeLists of the package that uses this rosmsg (called gslam_msgs):

cmake_minimum_required(VERSION 2.8.3)
project(gslam)

add_compile_options(-std=c++17)

find_package(catkin REQUIRED COMPONENTS
             gslam_msgs
             std_msgs
                 sensor_msgs
                 geometry_msgs
                   roscpp
             tf2_ros
)
find_package(Eigen3 REQUIRED)



catkin_package(
   INCLUDE_DIRS
        include
   CATKIN_DEPENDS
        roscpp
   LIBRARIES
        factorgraph  

)

include_directories(
  include
  ${Eigen3_INCLUDE_DIRS}
  ${catkin_INCLUDE_DIRS}
)

find_package(GTSAMCMakeTools)
# Find GTSAM components
find_package(GTSAM REQUIRED) # Uses installed package
include_directories(${GTSAM_INCLUDE_DIR})




install(DIRECTORY include/${PROJECT_NAME}/
        DESTINATION ${CATKIN_PACKAGE_INCLUDE_DESTINATION}
        FILES_MATCHING PATTERN "*.h"
        PATTERN ".svn" EXCLUDE)

add_library(factorgraph  
     src/factorgraph.cpp
) 
target_link_libraries(factorgraph
   gtsam
  ${catkin_LIBRARIES}
)

add_executable(main src/graph.cpp)
target_link_libraries(main
   factorgraph
   gtsam
  ${catkin_LIBRARIES}
)

And this is how I try to include:

#include "gslam_msgs/PoseNode.h"

And the CMakeL for the gslam_msgs:

cmake_minimum_required(VERSION 2.8.3)
project(gslam_msgs)

## Compile as C++11, supported in ROS Kinetic and newer
# add_compile_options(-std=c++11)

## Find catkin macros and libraries
## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
## is used, also find other catkin packages
find_package(catkin REQUIRED COMPONENTS
        message_generation
        std_msgs
        sensor_msgs
        geometry_msgs
        )



## Generate messages in the 'msg' folder
add_message_files(
        FILES
        BetweenFactor.msg
        Path2D.msg
        PoseNode.msg
)

## Generate added messages and services with any dependencies listed here
generate_messages(
        DEPENDENCIES
        std_msgs
        sensor_msgs
        geometry_msgs

)


catkin_package(
        #  INCLUDE_DIRS include
        #  LIBRARIES maxon_epos_msgs
        CATKIN_DEPENDS message_runtime std_msgs
        #  DEPENDS system_lib
)

###########
## Build ##
###########

## Specify additional locations of header files
## Your package locations should be listed before other locations
include_directories(
        # include
        ${catkin_INCLUDE_DIRS}
)