diff --git a/library/calendar_sync.py b/library/calendar_sync.py
index d1a2d20..0c9c4eb 100644
--- a/library/calendar_sync.py
+++ b/library/calendar_sync.py
@@ -20,7 +20,6 @@ def fetch_ics_events(url, user=None, password=None):
         raise Exception(f"ICS-Download fehlgeschlagen: {str(e)}")
 
 def connect_caldav(url, user=None, password=None, verify_ssl=True):
-    """Stellt Verbindung zum CalDAV-Kalender her"""
     try:
         client = DAVClient(
             url,
@@ -28,15 +27,17 @@ def connect_caldav(url, user=None, password=None, verify_ssl=True):
             password=password,
             ssl_verify_cert=verify_ssl
         )
-        # Kalender-URL aus Pfad extrahieren
-        path = urlparse(url).path
+        # Kalender-URL in String umwandeln
+        target_path = urlparse(url).path
         principal = client.principal()
+        
+        # Alle Kalender durchsuchen und URL als String vergleichen
         for calendar in principal.calendars():
-            if path in calendar.url:
+            if target_path in str(calendar.url):  # WICHTIG: URL in String konvertieren
                 return calendar
-        raise Exception("Kalender nicht gefunden")
+        raise Exception(f"Kalender mit Pfad '{target_path}' nicht gefunden")
     except Exception as e:
-        raise Exception(f"CalDAV-Verbindungsfehler: {str(e)}")
+        raise Exception(f"CalDAV-Fehler: {str(e)}")
 
 def sync_ics_to_caldav(module):
     """Haupt-Synchronisationslogik"""