fix previous fix

predict-gui.py

@@ -35,7 +35,7 @@ def process_file(input_file, config_file, weights_file, input_spectrometer_frequ
         input_spectrometer_frequency = None
     # Load configuration and initialize predictor
     config = OmegaConf.load(config_file)
-    model_ppm_per_point = config.data.get("frq_step", config.metadata.frq_step) / config.metadata.spectrometer_frequency
+    model_ppm_per_point = config.data.get("frq_step", config.metadata.get("frq_step")) / config.metadata.spectrometer_frequency
     predictor = initialize_predictor(config, weights_file)
 
     # Load input data