Unable to run create_react_agent using Ver: 1.0.3 of langchain-core

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1

ModuleNotFoundError Traceback (most recent call last)
Cell In[18], line 1
----> 1 from langchain.agents import AgentExecutor, create_react_agent
2 # Create the agent
3 agent = create_react_agent(llm, tools, prompt)

File f:\AgenticAI\Workplace\ag_env\Lib\site-packages\langchain\agents_init_.py:40
37 from langchain_core.tools.convert import tool
39 from langchain._api import create_importer
—> 40 from langchain.agents.agent import (
41 Agent,
42 AgentExecutor,
43 AgentOutputParser,
44 BaseMultiActionAgent,
45 BaseSingleActionAgent,
46 LLMSingleActionAgent,
47 )
48 from langchain.agents.agent_iterator import AgentExecutorIterator
49 from langchain.agents.agent_toolkits.vectorstore.base import (
50 create_vectorstore_agent,
51 create_vectorstore_router_agent,
52 )

File f:\AgenticAI\Workplace\ag_env\Lib\site-packages\langchain\agents\agent.py:48
45 from typing_extensions import Self, override
47 from langchain._api.deprecation import AGENT_DEPRECATION_WARNING
—> 48 from langchain.agents.agent_iterator import AgentExecutorIterator
49 from langchain.agents.agent_types import AgentType
50 from langchain.agents.tools import InvalidTool

File f:\AgenticAI\Workplace\ag_env\Lib\site-packages\langchain\agents\agent_iterator.py:33
30 from langchain_core.tools import BaseTool
31 from langchain_core.utils.input import get_color_mapping
—> 33 from langchain.schema import RUN_KEY
34 from langchain.utilities.asyncio import asyncio_timeout
36 if TYPE_CHECKING:

File f:\AgenticAI\Workplace\ag_env\Lib\site-packages\langchain\schema_init_.py:8
6 from langchain_core.documents import BaseDocumentTransformer, Document
7 from langchain_core.exceptions import LangChainException, OutputParserException
----> 8 from langchain_core.memory import BaseMemory
9 from langchain_core.messages import (
10 AIMessage,
11 BaseMessage,
(…) 19 messages_to_dict,
20 )
21 from langchain_core.messages.base import message_to_dict

ModuleNotFoundError: No module named ‘langchain_core.memory’

2

hi @PallaviPadav
Can you please run python -m langchain_core.sys_info and share the result?

3

System Information

OS: Windows
OS Version: 10.0.19045
Python Version: 3.14.0 | packaged by Anaconda, Inc. | (main, Oct 22 2025, 08:58:42) [MSC v.1929 64 bit (AMD64)]

Package Information

langchain_core: 1.0.3
langchain: 0.3.27
langchain_community: 0.3.31
langsmith: 0.4.39
langchain_classic: 1.0.0
langchain_groq: 1.0.0
langchain_huggingface: 1.0.1
langchain_openai: 0.3.35
langchain_sambanova: 1.0.0
langchain_text_splitters: 1.0.0
langgraph_sdk: 0.2.9

Optional packages not installed

langserve

Other Dependencies

aiohttp: 3.13.2
async-timeout: Installed. No version info available.
claude-agent-sdk: Installed. No version info available.
dataclasses-json: 0.6.7
groq: 0.33.0
httpx: 0.28.1
httpx-sse: 0.4.3
huggingface-hub: 0.36.0
jsonpatch: 1.33
langchain-anthropic: Installed. No version info available.
langchain-aws: Installed. No version info available.
langchain-azure-ai: Installed. No version info available.
langchain-cohere: Installed. No version info available.
langchain-deepseek: Installed. No version info available.
langchain-fireworks: Installed. No version info available.
langchain-google-genai: Installed. No version info available.
langchain-google-vertexai: Installed. No version info available.
langchain-mistralai: Installed. No version info available.
langchain-ollama: Installed. No version info available.
langchain-perplexity: Installed. No version info available.
langchain-together: Installed. No version info available.
langchain-xai: Installed. No version info available.
langsmith-pyo3: Installed. No version info available.
numpy: 2.3.4
openai: 2.6.1
openai-agents: Installed. No version info available.
opentelemetry-api: Installed. No version info available.
opentelemetry-exporter-otlp-proto-http: Installed. No version info available.
opentelemetry-sdk: Installed. No version info available.
orjson: 3.11.4
packaging: 25.0
pydantic: 2.12.3
pydantic-settings: 2.11.0
pytest: Installed. No version info available.
pyyaml: 6.0.3
PyYAML: 6.0.3
requests: 2.32.5
requests-toolbelt: 1.0.0
rich: Installed. No version info available.
sambanova: 1.1.6
sentence-transformers: 5.1.2
sqlalchemy: 2.0.44
SQLAlchemy: 2.0.44
tenacity: 9.1.2
tiktoken: 0.12.0
tokenizers: 0.22.1
transformers: 4.57.1
types-requests: 2.32.4.20250913
typing-extensions: 4.15.0
vcrpy: Installed. No version info available.
zstandard: 0.25.0

4

I can see it was planned to be removed in 1.0.0, but not able to find the migrated import

@deprecated(since=“0.3.3”,removal=“1.0.0”,message=("Please see the migration guide at: "“https://python.langchain.com/docs/versions/migrating_memory/”),)

class BaseMemory(Serializable, ABC):
“”"Abstract base class for memory in Chains.

Memory refers to state in Chains. Memory can be used to store information about
    past executions of a Chain and inject that information into the inputs of
    future executions of the Chain. For example, for conversational Chains Memory
    can be used to store conversations and automatically add them to future model
    prompts so that the model has the necessary context to respond coherently to
    the latest input.
5

langchain_core: 1.0.3
langchain: 0.3.27

that doesn’t look normal. Have you tried updating LangChain? with: pip install -U langchain

1 Like
6

Hey. Many of functions have moved to langchain_classic.

Try this to run create react agent: from langchain_classic.agents import create_react_agent

I hope it works