Update backend.py

backend.py

@@ -52,7 +52,7 @@ class InvoicePipeline:
     def _get_raw_text_from_pdf(self, path:str) -> str:
         text = ""
         pdf_reader = PdfReader(path)
-        for page in pdf_reader:
+        for page in pdf_reader.pages:
             text += page.extract_text()
         return text