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Hi,

the problems are all related to missing dependencies. Please make sure that all required packages are in your ROS_PACKAGE_PATH in every terminal you are using. You'll have to source the setup.bash in each of them. Try rospack find PACKAGE to check whether the package can be found. If you use Ubuntu, you may want to consider using the debian packages for the standard packages like gazebo since dependencies will then be automatically resolved by the package manager.

If you try to source multiple files, the variable definitions from the last setup.bash will be used. Normally, you only need this in case you have different ROS environments, e.g. parallel installations for diamondback and electric. In that case, you can define a bash alias to load the respective file manually.

best, Moritz