cannot pickle 'classmethod' object

Question

I try to run this code with a PDFTool, but I receive this following error

from crewai_tools import PDFSearchTool
rag_tool = PDFSearchTool(pdf='/content/17.pdf',
 config=dict(
 llm=dict(
 provider="groq", # or google, openai, anthropic, llama2, ...
 config=dict(
 model="llama3-8b-8192",
 # temperature=0.5,
 # top_p=1,
 # stream=true,
 ),
 ),
 embedder=dict(
 provider="huggingface", # or openai, ollama, ...
 config=dict(
 model="BAAI/bge-small-en-v1.5",
 #task_type="retrieval_document",
 # title="Embeddings",
 ),
 ),
 )
)

Error:

TypeError: cannot pickle 'classmethod' object

I have already defined the env. keys (GROQ_API_KEY), sounds like a incompatible versions of libraries.

I try to execute the code above, but, the error appear. I Want to use Groq api key to create a agent to search PDF information.