Fail to parse multiple document in yaml file

[Vikash082]

I have yaml file with multiple document . I am trying to read a value from one of the document and I am getting this error while trying to access "spec.selector.name" .

Below is the yaml:

apiVersion: apiextensions.k8s.io/v1beta1
kind: CustomResourceDefinition
metadata:
  name: epgs.aci.aw
spec:
  group: aci.aw
  names:
    kind: Epg
    listKind: EpgList
    plural: epgs
  scope: Namespaced
  version: v1
---
apiVersion: v1
kind: Service
metadata:
  name: ep-registry
  namespace: kube-system
  labels:
    app: gbpserver
spec:
  clusterIP: 10.96.0.2
  ports:
  - port: 14443
    targetPort: 14443
  selector:
    name: aci-containers-controller

Error:

Traceback (most recent call last):
  File "/tmp/ansible_yedit_payload_v_m8fh76/__main__.py", line 499, in load
AttributeError: module 'yaml' has no attribute 'RoundTripLoader'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/tmp/ansible_yedit_payload_v_m8fh76/__main__.py", line 501, in load
  File "/usr/lib/python3/dist-packages/yaml/__init__.py", line 94, in safe_load
    return load(stream, SafeLoader)
  File "/usr/lib/python3/dist-packages/yaml/__init__.py", line 72, in load
    return loader.get_single_data()
  File "/usr/lib/python3/dist-packages/yaml/constructor.py", line 35, in get_single_data
    node = self.get_single_node()
  File "/usr/lib/python3/dist-packages/yaml/composer.py", line 43, in get_single_node
    event.start_mark)
yaml.composer.ComposerError: expected a single document in the stream
  in "<unicode string>", line 1, column 1:
    apiVersion: apiextensions.k8s.io ... 
    ^
but found another document
  in "<unicode string>", line 14, column 1:
    ---
    ^

Is there a way to resolve this ?

[SaimonWoidig]

Got this issue aswell.