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2 ideas that might help:

First off, make sure ROS and your ROS workspace are sourced in this terminal. You can check by entering the following in a terminal:

echo $ROS_PACKAGE_PATH

It should show /opt/ros/[version]/share as well as files related to your workspace. If not, enter the following (and consider appending them to your ~/.bashrc):

source opt/ros/melodic/setup.bash
source ~/[workspace]/devel/setup.bash

Second, I believe std_msgs and rosgraph_msgs are core ROS packages (at least in Melodic) and should probably not be located in your catkin library. I recommend removing them and cleaning then building your workspace.

If these suggestions don't help, here are some similar questions to look at: 1, 2, 3

2 ideas that might help:

First off, make sure ROS and your ROS workspace are sourced in this terminal. You can check by entering the following in a terminal:

echo $ROS_PACKAGE_PATH

It should show /opt/ros/[version]/share as well as files related to your workspace. If not, enter the following (and consider appending them to your ~/.bashrc):

source opt/ros/melodic/setup.bash
/opt/ros/melodic/setup.bash
source ~/[workspace]/devel/setup.bash

Second, I believe std_msgs and rosgraph_msgs are core ROS packages (at least in Melodic) and should probably not be located in your catkin library. I recommend removing them and cleaning then building your workspace.

If these suggestions don't help, here are some similar questions to look at: 1, 2, 3