added repo for API access, still strange error in Group.vue

src/api/groupRepository.js

@@ -0,0 +1,19 @@
+// groupRepository.js
+
+import Repository from "./Repository";
+
+const resource = "/group";
+
+export default {
+    get() {
+        return Repository.get(`${resource}`);
+    },
+
+    getGroup(groupId) {
+        return Repository.get(`${resource}/${groupId}`);
+    },
+
+    createGroup(groupData) {
+        return Repository.post(`${resource}`, groupData);
+    },
+};