I’m trying to run a LangChain script that uses several modules including langchain, langchain-core, langchain-openai, and langchain-groq. However, I keep encountering the following error:

Traceback (most recent call last):
  File "/path/to/my/directory/langchain_processor.py", line 1, in <module>
    from langchain.output_parsers import (
ModuleNotFoundError: No module named 'langchain'

Unfortunately, I’m unable to import any of the modules mentioned above, including:

1. langchain.output_parsers
2. langchain_core.prompts
3. langchain_core.pydantic_v1
4. langchain_openai
5. langchain_groq

None of these modules can be imported, and I’m stuck with the ModuleNotFoundError.What’s even more puzzling is that I’ve verified that all of these modules are indeed in sys.path, which means Python should be able to find them. Despite this, I’m still getting the ModuleNotFoundError.

Here is a snippet of my langchain_processor.py script:

import os
from langchain.output_parsers import (
    OutputFixingParser,
    PydanticOutputParser,
)
from langchain_core.prompts import (
    PromptTemplate,
)
from langchain_core.pydantic_v1 import BaseModel, Field
from langchain_openai import ChatOpenAI
from langchain_groq import ChatGroq
import json
from typing import List, Tuple

My environment.yml file looks like this:

name: langchain-env
channels:
  - conda-forge
  - defaults
dependencies:
  - python=3.10
  - pip
  - pip:
      - langchain-core
      - langchain-openai
      - langchain-groq
      - pydantic
      - langchain

After activating my Conda environment, I confirmed that the packages are installed:

(langchain-env) > pip list
Package                  Version
------------------------ ---------
aiohttp                  3.9.5
aiosignal                1.3.1
annotated-types          0.6.0
anyio                    4.3.0
async-timeout            4.0.3
attrs                    23.2.0
certifi                  2024.2.2
charset-normalizer       3.3.2
colorama                 0.4.6
dataclasses-json         0.6.6
distro                   1.9.0
exceptiongroup           1.2.1
frozenlist               1.4.1
greenlet                 3.0.3
groq                     0.6.0
h11                      0.14.0
httpcore                 1.0.5
httpx                    0.27.0
idna                     3.7
jsonpatch                1.33
jsonpointer              2.4
langchain                0.2.0
langchain-core           0.2.0
langchain-groq           0.1.4
langchain-openai         0.1.7
langchain-text-splitters 0.2.0
langsmith                0.1.59
marshmallow              3.21.2
multidict                6.0.5
mypy-extensions          1.0.0
numpy                    1.26.4
openai                   1.30.1
orjson                   3.10.3
packaging                23.2
pip                      24.0
pydantic                 2.7.1
pydantic_core            2.18.2
PyYAML                   6.0.1
regex                    2024.5.15
requests                 2.31.0
setuptools               69.5.1
sniffio                  1.3.1
SQLAlchemy               2.0.30
tenacity                 8.3.0
tiktoken                 0.7.0
tqdm                     4.66.4
typing_extensions        4.11.0
typing-inspect           0.9.0
urllib3                  2.2.1
wheel                    0.43.0
yarl                     1.9.4

I can’t seem to resolve this ModuleNotFoundError. How can I properly load these modules?