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Fix ModuleNotFoundError: No module named 'langchain' #425

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Fix ModuleNotFoundError: No module named 'langchain' #425

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DaWe35
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@DaWe35 DaWe35 commented Mar 20, 2025

  • Fixes ModuleNotFoundError: No module named 'langchain'

Reproduce: start a deep research and you'll get this error.

Detailed log:

browser-use-webui-1  | Traceback (most recent call last):
browser-use-webui-1  | 2025-03-20 14:45:08,029 DEBG 'webui' stderr output:
browser-use-webui-1  | Traceback (most recent call last):
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/queueing.py", line 625, in process_events
browser-use-webui-1  |     response = await route_utils.call_process_api(
browser-use-webui-1  |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/route_utils.py", line 322, in call_process_api
browser-use-webui-1  |     output = await app.get_blocks().process_api(
browser-use-webui-1  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/blocks.py", line 2045, in process_api
browser-use-webui-1  |     result = await self.call_function(
browser-use-webui-1  |              ^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  | 
browser-use-webui-1  | 2025-03-20 14:45:08,029 DEBG 'webui' stderr output:
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/blocks.py", line 1590, in call_function
browser-use-webui-1  |     prediction = await fn(*processed_input)
browser-use-webui-1  |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/utils.py", line 837, in async_wrapper
browser-use-webui-1  |     response = await f(*args, **kwargs)
browser-use-webui-1  |                ^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/app/webui.py", line 692, in run_deep_search
browser-use-webui-1  |     from src.utils.deep_research import deep_research
browser-use-webui-1  |   File "/app/src/utils/deep_research.py", line 22, in <module>
browser-use-webui-1  |     from langchain.schema import SystemMessage, HumanMessage
browser-use-webui-1  | ModuleNotFoundError: No module named 'langchain'
browser-use-webui-1  | Traceback (most recent call last):
browser-use-webui-1  | 
browser-use-webui-1  | 2025-03-20 14:45:08,029 DEBG 'webui' stderr output:
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/queueing.py", line 625, in process_events
browser-use-webui-1  |     response = await route_utils.call_process_api(
browser-use-webui-1  |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/route_utils.py", line 322, in call_process_api
browser-use-webui-1  |     output = await app.get_blocks().process_api(
browser-use-webui-1  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/blocks.py", line 2045, in process_api
browser-use-webui-1  |     result = await self.call_function(
browser-use-webui-1  |              ^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/blocks.py", line 1590, in call_function
browser-use-webui-1  |     prediction = await fn(*processed_input)
browser-use-webui-1  |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/utils.py", line 837, in async_wrapper
browser-use-webui-1  |     response = await f(*args, **kwargs)
browser-use-webui-1  |                ^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/app/webui.py", line 692, in run_deep_search
browser-use-webui-1  |     from src.utils.deep_research import deep_research
browser-use-webui-1  |   File "/app/src/utils/deep_research.py", line 22, in <module>
browser-use-webui-1  |     from langchain.schema import SystemMessage, HumanMessage
browser-use-webui-1  | ModuleNotFoundError: No module named 'langchain'
browser-use-webui-1  | 
browser-use-webui-1  | 2025-03-20 14:45:08,029 DEBG 'webui' stderr output:
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/queueing.py", line 625, in process_events
browser-use-webui-1  |     response = await route_utils.call_process_api(
browser-use-webui-1  |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/route_utils.py", line 322, in call_process_api
browser-use-webui-1  |     output = await app.get_blocks().process_api(
browser-use-webui-1  |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/blocks.py", line 2045, in process_api
browser-use-webui-1  |     result = await self.call_function(
browser-use-webui-1  |              ^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/blocks.py", line 1590, in call_function
browser-use-webui-1  |     prediction = await fn(*processed_input)
browser-use-webui-1  |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/usr/local/lib/python3.11/site-packages/gradio/utils.py", line 837, in async_wrapper
browser-use-webui-1  |     response = await f(*args, **kwargs)
browser-use-webui-1  |                ^^^^^^^^^^^^^^^^^^^^^^^^
browser-use-webui-1  |   File "/app/webui.py", line 692, in run_deep_search
browser-use-webui-1  |     from src.utils.deep_research import deep_research
browser-use-webui-1  |   File "/app/src/utils/deep_research.py", line 22, in <module>
browser-use-webui-1  |     from langchain.schema import SystemMessage, HumanMessage
browser-use-webui-1  | ModuleNotFoundError: No module named 'langchain'

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CLAassistant commented Mar 20, 2025 •
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@warmshao
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langchain should have installed with browser-use? have you installed it?

@DaWe35
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DaWe35 commented Mar 27, 2025

langchain should have installed with browser-use? have you installed it?

I'm using web-ui in docker. I didn't install browser-use separately, since the README.md doesn't specify it. I just started the repo with docker compose up and I got this error when trying to do a deep research. Are you sure it is a problem with my setup?

@DaWe35 DaWe35 mentioned this pull request Mar 27, 2025
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@DaWe35 @CLAassistant @warmshao