Fix setup

tool.py

@@ -229,7 +229,7 @@ class VisualRAGTool(Tool):
 
     def preprocess(self, files: List[str], contextualize: bool = True, api_key: str = None, window: int = 10) -> List[Page]:
         """Preprocesses the files and extracts metadata."""
-        pages = [page for file in files for page in self._process_file(file, contextualize=contextualize, api_key=api_key, window=window)]     
+        pages = [page for file in files for page in self._preprocess_file(file, contextualize=contextualize, api_key=api_key, window=window)]     
 
         print(f"Example metadata:\n{pages[0].metadata.context}")