Error in vscode: "ros/ros.h"- No such file or directory

edit

Hi all, i am new in ROS and am trying to setup my vscode environment for ROS. I searched a lot for the right answer but could not solve my problem. I inlcuded all important lines in my CMakeList but the error is still not gone, so i am clearly missing something. I am using melodic 1.14.10 on Ubuntu.

Here is my CMakeList:

cmake_minimum_required(VERSION 3.0.2)
project(hello)


find_package(catkin REQUIRED COMPONENTS
  nav_msgs
  roscpp
  rospy
  sensor_msgs
  std_msgs
  geometry_msgs
  message_filters 
)


catkin_package(
  INCLUDE_DIRS include
  LIBRARIES hello
  CATKIN_DEPENDS nav_msgs roscpp rospy sensor_msgs std_msgs geometry_msgs message_filters
  DEPENDS system_lib
)


include_directories(
  #include/hello
  ${catkin_INCLUDE_DIRS}
)

add_library(${PROJECT_NAME}
   src/ekf.cpp
)

## add_executable(EKF src/main.cpp)
add_executable(EKF src/main.cpp src/ekf.cpp)

target_link_libraries(EKF ${catkin_LIBRARIES})

My tasks.json:

{
    "tasks": [
        {
            "type": "shell",
            "label": "C/C++: cpp Aktive Datei kompilieren",
            "command": "/usr/bin/cpp",
            "args": [
                "-g",
                "${file}",
                "-o",
                "${fileDirname}/${fileBasenameNoExtension}"
            ],
            "options": {
                "cwd": "${fileDirname}"
            },
            "problemMatcher": [
                "$gcc"
            ],
            "group": {
                "kind": "build",
                "isDefault": true
            },
            "detail": "Vom Debugger generierte Aufgabe."
        }
    ],
    "version": "2.0.0"
}

My simple header file with the #include ros/ros.h causing the problem:

#include <ros/ros.h>
#include <std_msgs/String.h>
#include <sensor_msgs/LaserScan.h>
#include <nav_msgs/Odometry.h>
#include "tf/tf.h"
#include <geometry_msgs/Twist.h>

#include <fstream>
#include <cmath>
#include <math.h>
#include <string>
#include <vector>

using namespace std;

class EKF{
    public:

        vector<double> landmarks;
        int count;

        vector<double> readFile(ros::NodeHandle nh);

};

I could not attach a screenshot to show the error, but it says exactly the this line:

"ros/ros.h"- No such file or directory

I really appreciate your support.