I am getting astrapy.core.api.APIRequestError while trying to connect to AstraDB, I am aware what error is saying but I did not find any solution.

Complete Error:
astrapy.core.api.APIRequestError: {"errors":[{"message":"No "findCollections" command found as "GeneralCommand"","errorCode":"NO_COMMAND_MATCHED"}]}

Code:

from dotenv import load_dotenv
import os
from langchain_openai import ChatOpenAI, OpenAIEmbeddings
from langchain_astradb import AstraDBVectorStore
from langchain.agents import create_tool_calling_agent
from langchain.agents import AgentExecutor

from langchain.tools.retriever import create_retriever_tool
from langchain import hub
from langchain_community.llms import ollama
from langchain_community.embeddings import OllamaEmbeddings
from langchain_huggingface.embeddings import HuggingFaceEmbeddings
from github import fetch_github_issues

# load env variables
load_dotenv()

# connect to vectordb
def connect_to_vstore():
    embeddings=HuggingFaceEmbeddings()
    ASTRA_DB_API_ENDPOINT = os.getenv("ASTRA_DB_API_ENDPOINT")
    ASTRA_DB_APPLICATION_TOKEN = os.getenv("ASTRA_DB_APPLICATION_TOKEN")
    desired_namespace = os.getenv("ASTRA_DB_KEYSPACE")

    if desired_namespace:
        ASTRA_DB_KEYSPACE = desired_namespace
    else:
        ASTRA_DB_KEYSPACE = None

    vstore = AstraDBVectorStore(
        embedding=embeddings,
        collection_name="github",
        api_endpoint=ASTRA_DB_API_ENDPOINT,
        token=ASTRA_DB_APPLICATION_TOKEN,
        namespace=ASTRA_DB_KEYSPACE,       # name of the database or table
    )
    return vstore

vstore = connect_to_vstore()

Could you please provide me any workaround/solution. so that I can do similarity search from astradb.