AttributeError: '_GeneratorContextManager' object has no attribute 'get_next_version'

[smanna123]

when i am trying to langgraph customer support example (https://langchain-ai.github.io/langgraph/tutorials/customer-support/customer-support/) , it is facing below error---

Traceback (most recent call last):
File "/home/broadifi/Desktop/ofc_project/lang_graph_bot/agentic_bot.py", line 406, in
for event in events:
File "/home/broadifi/Desktop/ofc_project/lang_graph_bot/venv/lib/python3.10/site-packages/langgraph/pregel/init.py", line 1190, in stream
with SyncPregelLoop(
File "/home/broadifi/Desktop/ofc_project/lang_graph_bot/venv/lib/python3.10/site-packages/langgraph/pregel/loop.py", line 562, in init
self.checkpointer_get_next_version = checkpointer.get_next_version
AttributeError: '_GeneratorContextManager' object has no attribute 'get_next_version'

with the older version it was working fine but after upgradation it is facing above error

[vbarda]

@smanna123 it looks like you're using SqliteSaver.from_conn_string() as a checkpointer, but it actually is a context manager. the right way to use it is

with SqliteSaver.from_conn_string(...) as checkpointer:
    app = graph.compile(checkpointer=checkpointer)
    app.invoke(...)

hope this helps!

[TonySimonovsky]

This code(from the topic) is actually from your DeepLearning course

[githubramu]

from langgraph.checkpoint.memory import MemorySaver
memory = MemorySaver()

This fixed the issue.