diff --git a/src/api/server.py b/src/api/server.py
index adbb851..570b923 100644
--- a/src/api/server.py
+++ b/src/api/server.py
@@ -36,7 +36,7 @@
 EVENT_LOG = 'event-log'
 FILE = 'file'
 CASE_ID = 'case-id'
-EVENT_ID = 'event-id'
+CASE_PREFIX = 'case-prefix'
 
 ALLOWED_EXTENSIONS = {'xes', 'csv'}
 
@@ -96,10 +96,10 @@ def event_log():
             }), __BAD_REQUEST__
 
         caseID = request.args.get(CASE_ID)
-        eventID = request.args.get(EVENT_ID)
+        casePrefix = request.args.get(CASE_PREFIX)
 
         try:
-            id = put_event_log(file, caseID, eventID)
+            id = put_event_log(file, caseID, casePrefix)
 
             importer = XES_Importer()
 
@@ -112,7 +112,8 @@ def event_log():
                 'id': id,
                 'activities': list(activities)
             })
-        except:  # noqa: E722
+        except Error as e:  # noqa: E722
+            print(e)
             return jsonify({
                 'error': "Could not import file."
             }), __BAD_REQUEST__
diff --git a/src/components/util/event_store.py b/src/components/util/event_store.py
index 4e87242..c49c324 100644
--- a/src/components/util/event_store.py
+++ b/src/components/util/event_store.py
@@ -97,7 +97,7 @@ def put_event_log_str(content) -> str:
     return id
 
 
-def put_event_log(file, caseID, eventID) -> str:
+def put_event_log(file, caseID, casePrefix) -> str:
     """Cache the event log."""
     id = uuid.uuid4().hex
 
@@ -112,15 +112,15 @@ def put_event_log(file, caseID, eventID) -> str:
         if caseID is None:
             raise CaseIdNotFoundError
 
-        if eventID is None:
-            raise EventIdNotFoundError
+        if casePrefix is None:
+            casePrefix = 'case:'
 
         log_csv = pd.read_csv(path, sep=',')
         # log_csv.rename(columns={'clientID': 'case:clientID'}, inplace=True)
         parameters = {log_conv.Variants.
                       TO_EVENT_LOG.value.Parameters.CASE_ID_KEY: caseID,
                       log_conv.Variants.TO_EVENT_LOG.value.
-                      Parameters.CASE_ATTRIBUTE_PREFIX: eventID}
+                      Parameters.CASE_ATTRIBUTE_PREFIX: casePrefix}
         event_log = log_conv.apply(log_csv,
                                    parameters=parameters,
                                    variant=log_conv.Variants.TO_EVENT_LOG)