[Python] Running a Flask python Function give me : 'str' object has no attribute 'copy'

I'm working with a LLM project where i have a PDF file that is being processed with LamaIndexParse , when i upload the file the api for parsing works fine then the server print the error :

INFOrocessing:Stored 6 chunks for agent da829d70-54d2-4c04-b806-3940a7195bd1
ERRORrocessing:Error processing PDF: 'str' object has no attribute 'copy'
ERROR:__main__DF processing failed for da829d70-54d2-4c04-b806-3940a7195bd1: 'str' object has no attribute 'copy'


The script contain more than 500 line so i will provide a snipe of the code :

try:
# Parse PDF with LlamaParse
parsed_docs = self.llamaparse.parse(pdf_path)
if not parsed_docs:
raise ValueError("LlamaParse could not parse the PDF.")

documents = []
doc_level_metadata = {}

for i, doc in enumerate(parsed_docs):
# Step 1: Extract text and raw metadata from LlamaParse
if isinstance(doc, dict):
text = doc.get('text', '')
raw_metadata = doc.get('metadata', {})
elif isinstance(doc, tuple):
text = doc[0]
raw_metadata = doc[1] if len(doc) > 1 else {}
else:
text = str(doc)
raw_metadata = {}

# Step 2: Ensure metadata is always a dict
metadata = {}
if isinstance(raw_metadata, dict):
metadata = raw_metadata.copy()
elif isinstance(raw_metadata, str):
try:
parsed = json.loads(raw_metadata)
if isinstance(parsed, dict):
metadata = parsed
else:
metadata = {}
except Exception:
metadata = {}


i have tried to check if the copy method is applied on an STR type variable to ensure that it work put still no result.

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