No Module Named ’langchain.chat_models’: Troubleshooting Guide If you encounter the error message “No module named ’langchain.chat_models’” in your Python code, it means that the module or package ’langchain’ cannot be found or imported correctly. This error usually occurs when the required package or module is missing, not installed, or improperly referenced in your code. In this article, we will discuss some possible causes of this error and provide troubleshooting steps to resolve it.