diff --git a/remindme_caldav.py b/remindme_caldav.py
index 1949dfb..1d309bf 100644
--- a/remindme_caldav.py
+++ b/remindme_caldav.py
@@ -30,20 +30,23 @@ def parse_args():
     parser.add_argument('--loglevel', choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'], default='INFO', help='Set the logging level')
     args = parser.parse_args()
     if args.config is None:
-        raise RuntimeError("No config file provided. Please use --config path_to_config.toml")
+        logging.error("No config file provided. Please use --config path_to_config.toml")
+        sys.exit(1)
     return args
 
 def read_file(filename):                                       
     try:                                                       
         return Path(filename).read_text()                      
     except FileNotFoundError as e:                             
-        raise RuntimeError("Error: The specified file does not exist.")
+        logging.error("Error: The specified file does not exist.")
+        sys.exit(1)
                                                                
 def parse_toml(content):                                       
     try:                                                       
         return toml.loads(content)                             
     except Exception as e:                                     
-        raise RuntimeError("Error: Failed to parse TOML file.")             
+        logging.error("Error: Failed to parse TOML file.")             
+        sys.exit(1)
 
 def calculate_event_hash(event):
     return hashlib.md5(json.dumps(event, sort_keys=True, cls=DateTimeEncoder).encode()).hexdigest()