catkin_pkg.package.InvalidPackage: Error(s) in package '/home/user/catkin_ws/src/mavlink/patch/package.xml': Package version ":{version}" does not follow version conventions

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Hello everyone, Hope you are having a great time. I'm kind of new to ROS and recently I have been tasked with building an old ROS project.
Since the project uses the old kinetic version, I also opt out to use Ubuntu 16.04 and installed the same version of ROS. When it came to install mavlink and mavros, I first tried the binary packages provided here: https://docs.px4.io/master/en/ros/mav...
But I faced these errors : https://pastebin.com/ybr0fVZV , then I though maybe I need to build from source because of this issue. so I went ahead and followed the instructions at px4 documentation and tried to build and install the mavlink/mavros from source.

However at the very final end, it fails with the following error message :

Workspace configuration appears valid.
---------------------------------------------------------
Traceback (most recent call last):
  File "/usr/bin/catkin", line 11, in <module>
    load_entry_point('catkin-tools==0.6.1', 'console_scripts', 'catkin')()
  File "/usr/lib/python2.7/dist-packages/catkin_tools/commands/catkin.py", line 272, in main
    catkin_main(sysargs)
  File "/usr/lib/python2.7/dist-packages/catkin_tools/commands/catkin.py", line 267, in catkin_main
    sys.exit(args.main(args) or 0)
  File "/usr/lib/python2.7/dist-packages/catkin_tools/verbs/catkin_build/cli.py", line 422, in main
    summarize_build=opts.summarize  # Can be True, False, or None
  File "/usr/lib/python2.7/dist-packages/catkin_tools/verbs/catkin_build/build.py", line 283, in build_isolated_workspace
    workspace_packages = find_packages(context.source_space_abs, exclude_subspaces=True, warnings=[])
  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 155, in find_packages_allowing_duplicates
    path_parsed_packages, warnings_lists = zip(*pool.map(parser, data))
  File "/usr/lib/python2.7/multiprocessing/pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/usr/lib/python2.7/multiprocessing/pool.py", line 567, in get
    raise self._value
catkin_pkg.package.InvalidPackage: Error(s) in package '/home/user/catkin_ws/src/mavlink/patch/package.xml':
Package version ":{version}" does not follow version conventions

I have installed Python 2.7.12 (using Anaconda and my GCC version is gcc (Ubuntu 5.4.0-6ubuntu1~16.04.12) 5.4.0 20160609. What is wrong and how should I fix this ? By the way here is the full log that ends up with the posted error message.

ser@ubuntu:~/catkin_ws$ rosinstall_generator --rosdistro kinetic mavlink | tee /tmp/mavros.rosinstall
- git:
    local-name: mavlink
    uri: https://github.com/mavlink/mavlink-gbp-release.git
    version: release/kinetic/mavlink/2021.3.3-1

user@ubuntu:~/catkin_ws$ rosinstall_generator --upstream mavros --deps | tee -a /tmp/mavros.rosinstall
Using ROS_DISTRO: kinetic
The following repositories with an unknown upstream will be ignored: rosbag_migration_rule
- git:
    local-name: actionlib
    uri: https://github.com/ros/actionlib.git
    version: 1.11.16
- git:
    local-name: angles
    uri: https://github.com/ros/angles.git
    version: 1.9.12
- git:
    local-name: catkin
    uri: https://github.com/ros/catkin.git
    version: 0.7.29
- git:
    local-name: class_loader
    uri: https://github.com/ros/class_loader.git
    version: 0.3 ...