Prompt error

context str = "abc"
query_str = "def"
    template = ("We have provided context information below. \n"
                "---------------------\n"
                f"{context_str}\n"
                "\n---------------------\n"
                f"Given this information, please answer the question: {query_str}\n")
    text_qa_template = Prompt(template=template)
    vector_store = WeaviateVectorStore(weaviate_client=client, index_name="LlamaIndex")
    index = VectorStoreIndex.from_vector_store(vector_store=vector_store)

    query_engine = index.as_query_engine(text_qa_template=text_qa_template)
    response = str(query_engine.query(query_str))

I am getting the error below in the above snippet of code:
pydantic.error_wrappers.ValidationError: 1 validation error for PromptTemplate
root
Invalid prompt schema; check for mismatched or missing input parameters. '"url"'
(type=value_error)

Can anyone please help me with the same? Thanks.

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Prompt error