MalformedYAMLError: yaml: line 3

I followed all of the steps to deploy bigbang. However, I am running into issues with kustomization. When I try to run "kustomize build" inside the base/ folder, I get the following error:

Error: accumulating resources: accumulating resources from 'https://repo1.dso.mil/platform-one/big-bang/bigbang.git/base?ref=2.33.0': MalformedYAMLError: yaml: line 3: mapping values are not allowed in this context in File: https://repo1.dso.mil/platform-one/big-bang/bigbang.git/base?ref=2.33.0

my kustomization file:

apiVersion: kustomize.config.k8s.io/v1beta1
kind: Kustomization

configMapGenerator:
  - behavior: merge
    name: common
    files:
      - values.yaml=configmap.yaml

resources:
  - https://repo1.dso.mil/platform-one/big-bang/bigbang.git/base?ref=2.33.0

patches:
  - patch: secrets.enc.yaml