diff --git a/rag/app/naive.py b/rag/app/naive.py
index 99ab99713a..44462da3d4 100644
--- a/rag/app/naive.py
+++ b/rag/app/naive.py
@@ -1133,9 +1133,7 @@ def chunk(filename, binary=None, from_page=0, to_page=MAXIMUM_PAGE_NUMBER, lang=
         callback(0.1, "Start to parse.")
         sections = TxtParser()(filename, binary, parser_config.get("chunk_token_num", 128), parser_config.get("delimiter", "\n!?;。；！？"))
         sections = _normalize_section_text_for_rtl_presentation_forms(sections)
-        print("\n", "-" * 150, "\n")
-        print(sections)
-        print("\n", "-" * 150, "\n")
+        logging.info("TxtParser produced %d sections for %s", len(sections), filename)
         callback(0.8, "Finish parsing.")
 
     elif re.search(r"\.(md|markdown|mdx)$", filename, re.IGNORECASE):
diff --git a/rag/app/presentation.py b/rag/app/presentation.py
index 3a254d82b8..ef2c77fe75 100644
--- a/rag/app/presentation.py
+++ b/rag/app/presentation.py
@@ -87,7 +87,7 @@ class Pdf(PdfParser):
                 # pn_index in tbls is absolute page number
                 current_page_num = int(pn_index) + 1
             except Exception as e:
-                print(f"Error parsing position: {e}")
+                logging.warning(f"Error parsing position in {filename}: {e}")
                 continue
 
             if not (from_page < current_page_num <= to_page + from_page):