catkin_make fails with Invalid email and Invalid package [closed]

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When I try to catkin_make my workspace the following is output:

Base path: /home/user/catkin_ws
Source space: /home/user/catkin_ws/src
Build space: /home/user/catkin_ws/build
Devel space: /home/user/catkin_ws/devel
Install space: /home/user/catkin_ws/install
Package name "${pkg_name}" does not follow naming conventions
Invalid email "${email}" for person "${author}"
Invalid email "${email}" for person "${author}"

When I try to launch a launchfile which had been working fine before (and nothing changed on the file or the related files):

Traceback (most recent call last):
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/__init__.py", line 225, in main
    args = rlutil.resolve_launch_arguments(args)
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslaunch/rlutil.py", line 92, in resolve_launch_arguments
    resolved = roslib.packages.find_resource(args[0], args[1])
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/roslib/packages.py", line 504, in find_resource
    source_path_to_packages=source_path_to_packages)
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/catkin/find_in_workspaces.py", line 143, in find_in_workspaces
    source_path_to_packages[source_path] = find_packages(source_path)
  File "/usr/lib/python2.7/dist-packages/catkin_pkg/packages.py", line 87, in find_packages
    packages = find_packages_allowing_duplicates(basepath, exclude_paths=exclude_paths, 
exclude_subspaces=exclude_subspaces, warnings=warnings)
  File "/usr/lib/python2.7/dist-packages/catkin_pkg/packages.py", line 137, in find_packages_allowing_duplicates
    xml, filename=filename, warnings=warnings)
  File "/usr/lib/python2.7/dist-packages/catkin_pkg/package.py", line 589, in parse_package_string
    pkg.validate(warnings=warnings)
  File "/usr/lib/python2.7/dist-packages/catkin_pkg/package.py", line 268, in validate
    raise InvalidPackage('\n'.join(errors))
InvalidPackage: Package name "${pkg_name}" does not follow naming conventions
Invalid email "${email}" for person "${author}"
Invalid email "${email}" for person "${author}"

What I did do before this occurred was following the "Create your rqt plugin package" tutorial and at some point ran cmake on the package which added a bunch of folders and files to my catkin workspace (in retrospect, I think I misunderstood the wording on the tutorial...) I tried deleting the new stuff but that just caused more errors.

I'm not sure what exactly happened and how to fix it. Any help is appreciated.

EDIT: The problem turned out to be exactly what the error message said, there was actually a package.xml with the placeholders ${pkg_name} etc in the catkin workspace. Removed that and everything worked again.