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app.py

@@ -109,9 +109,11 @@ def forecast(
 
     freq_str, domain = FREQ_MAP.get(freq_choice, ("H", "Energy"))
 
-    # Build gluonts-style entry
+    # Build gluonts-style entry. pandas prefers lowercase freq for Period,
+    # but the model's seasonal_scale_factor expects uppercase (e.g. "H", "D").
+    _period_freq = freq_str.lower() if freq_str.upper() == freq_str else freq_str
     try:
-        start = pd.Period("2020-01-01", freq=freq_str)
+        start = pd.Period("2020-01-01", freq=_period_freq)
     except Exception:
         start = pd.Period("2020-01-01", freq="D")