fix build

src/backend/Installer.ts

@@ -1,5 +1,6 @@
 import { Plugin } from "frontblock-generic/Plugin"
 import { getLogger } from "frontblock-generic/Types"
+import { FrontworkAdmin } from "./Admin";
 var exec = require('child-process-promise').exec;
 
 const logger = getLogger("installer", 'info') 
@@ -16,7 +17,8 @@ export const installAdmin = (plugins: Plugin[] = []) => {
     exec("npm i " + deps).then(async process => {
         logger.debug(process.stdout)    
         const Admin = require("./Admin").FrontworkAdmin
-        const fbAdmin = new Admin(plugins)
+        const fbAdmin:FrontworkAdmin = new Admin(plugins)
+        fbAdmin.start()
     })
 
 }