Update app.py

app.py

@@ -51,7 +51,7 @@ def get_ref_content(path: str) -> str | object:
     if path.endswith('mp3') or path.startswith('https://www.youtube.com/'):
         file = librosa.load(path)
     elif path.endswith('.xlsx') or path.endswith('.xls'):
-        file = pd.read_excel(path).to_json()
+        file = pd.read_excel(path).to_string()
     elif path.startswith('http'):
         file = requests.get(path).content
     else: