corrected path

app.py

@@ -220,7 +220,8 @@ def data():
         # Read sqlite query results into a pandas DataFrame
         # con = sqlite3.connect("database.db")
         # df = pd.read_sql_query(f"SELECT * from {tblname}", con)
-        df = pd.read_csv(f"referencefiles\{tblname}.csv")
+        filepath = f".referencefiles/{tblname}.csv"
+        df = pd.read_csv(filepath)
         top_records = df.copy()
         # con.close()
         html_top_records = top_records.to_html(index=False, table_id= f'dtable_{tblname}', classes='display nowrap table table-bordered table-striped table-condensed small p-1', justify='left')