PointerToNowhere Exception when validating CRDs using OpenAPI Schema Validator

I have tried creating a schema and validating yaml file structures based on their datatype and I have been constantly getting the same error no matter how I try to resolve it.

The source code where I'm getting this error is here: Openapi_validation

Error Message:

❌ Validation Error: PointerToNowhere: '/components/schemas/CustomAttribute' does not exist within {'oneOf': [{'type': 'string', 'minLength': 0, 'maxLength': 100, 'default': '', 'pattern': '.*', 'description': 'A string value.'}, {'type': 'integer', 'minimum': 0, 'maximum': 100, 'default': 0, 'description': 'An integer value.'}, {'type': 'boolean', 'default': False, 'enum': [True, False], 'description': 'A boolean value.'}, {'type': 'array', 'items': {'oneOf': [{'type': 'string'}, {'type': 'integer'}, {'type': 'boolean'}, {'$ref': '#/components/schemas/CustomAttribute'}]}, 'default': [], 'description': 'An array of values.'}, {'type': 'object', 'properties': {'default': {'type': 'object'}, 'description': {'type': 'string'}, 'properties': {'type': 'object', 'additionalProperties': {'$ref': '#/components/schemas/CustomAttribute'}}}, 'required': ['default', 'description', 'properties']}]}

Codes to run and check in local machine

openapi_schema.yaml

openapi: 3.0.0
info:
  title: Custom CRD Validation Schema
  version: 1.0.0
components:
  schemas:
    CustomAttribute:
      oneOf:
        - type: string
          minLength: 0
          maxLength: 100
          default: ""
          pattern: ".*"
          description: "A string value."
        - type: integer
          minimum: 0
          maximum: 100
          default: 0
          description: "An integer value."
        - type: boolean
          default: false
          enum: [true, false]
          description: "A boolean value."
        - type: array
          items:
            oneOf:
              - type: string
              - type: integer
              - type: boolean
              - $ref: "#/components/schemas/CustomAttribute"
          default: []
          description: "An array of values."
        - type: object
          properties:
            default:
              type: object
            description:
              type: string
            properties:
              type: object
              additionalProperties:
                $ref: "#/components/schemas/CustomAttribute"
          required: [default, description, properties]

validate_crd.py

import yaml
import json
from openapi_schema_validator import validate
import sys

# Load OpenAPI schema
with open("openapi_schema.yaml", "r") as f:
    openapi_schema = yaml.safe_load(f)

# Load CRD file
with open(sys.argv[1], "r") as f:
    crd_data = yaml.safe_load(f)

# Extract the schema definition correctly
custom_schema = openapi_schema["components"]["schemas"]["CustomAttribute"]

# Validate CRD file
try:
    validate(instance=crd_data["customAttribute"], schema=custom_schema)
    print("✅ CRD is valid.")
except Exception as e:
    print(f"❌ Validation Error: {e}")

valid_crd.yaml

customAttribute:
  type: object
  default: {}
  description: "A complex object with multiple properties."
  properties:
    name:
      type: string
      minLength: 3
      maxLength: 20
      default: "John Doe"
      pattern: "^[A-Za-z ]+$"
      description: "The name of the user."
    age:
      type: integer
      minimum: 18
      maximum: 100
      default: 25
      description: "The age of the user."
    isActive:
      type: boolean
      default: true
      enum: [true, false]
      description: "Indicates if the user is active."
    roles:
      type: array
      default: ["user", "admin"]
      description: "List of user roles."
      items:
        type: string
    settings:
      type: object
      default: {}
      description: "User settings."
      properties:
        theme:
          type: string
          default: "dark"
          description: "Preferred theme."
        notifications:
          type: boolean
          default: true
          description: "Enable or disable notifications."

Steps to Reproduce

• Run pip install pyyaml openapi_schema_validator
• Run python validate_crd.py valid_crd.yaml

It would really help if there is any fix for this