ValueError: Namespace GES not available

When building with gst-build I always get this issue when the gir file is being generated:

Traceback (most recent call last):
  File "gesotioformatter.py", line 14, in <module>
  File "/usr/lib64/python3.8/site-packages/gi/__init__.py", line 129, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace GES not available