runtime error

er/.local/lib/python3.8/site-packages/langchain/prompts/chat.py", line 10, in <module> from langchain.memory.buffer import get_buffer_string File "/home/user/.local/lib/python3.8/site-packages/langchain/memory/__init__.py", line 24, in <module> from langchain.memory.vectorstore import VectorStoreRetrieverMemory File "/home/user/.local/lib/python3.8/site-packages/langchain/memory/vectorstore.py", line 10, in <module> from langchain.vectorstores.base import VectorStoreRetriever File "/home/user/.local/lib/python3.8/site-packages/langchain/vectorstores/__init__.py", line 2, in <module> from langchain.vectorstores.analyticdb import AnalyticDB File "/home/user/.local/lib/python3.8/site-packages/langchain/vectorstores/analyticdb.py", line 15, in <module> from langchain.embeddings.base import Embeddings File "/home/user/.local/lib/python3.8/site-packages/langchain/embeddings/__init__.py", line 19, in <module> from langchain.embeddings.openai import OpenAIEmbeddings File "/home/user/.local/lib/python3.8/site-packages/langchain/embeddings/openai.py", line 66, in <module> class OpenAIEmbeddings(BaseModel, Embeddings): File "pydantic/main.py", line 197, in pydantic.main.ModelMetaclass.__new__ File "pydantic/fields.py", line 506, in pydantic.fields.ModelField.infer File "pydantic/fields.py", line 436, in pydantic.fields.ModelField.__init__ File "pydantic/fields.py", line 552, in pydantic.fields.ModelField.prepare File "pydantic/fields.py", line 663, in pydantic.fields.ModelField._type_analysis File "pydantic/fields.py", line 808, in pydantic.fields.ModelField._create_sub_type File "pydantic/fields.py", line 436, in pydantic.fields.ModelField.__init__ File "pydantic/fields.py", line 552, in pydantic.fields.ModelField.prepare File "pydantic/fields.py", line 668, in pydantic.fields.ModelField._type_analysis File "/usr/local/lib/python3.8/typing.py", line 774, in __subclasscheck__ return issubclass(cls, self.__origin__) TypeError: issubclass() arg 1 must be a class

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