VPHOT Upload seems to be off line

When you click on Upload, the following error is displayed:

erver Error in '/app' Application.

Parser Error

Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately.

Parser Error Message: Could not load the assembly 'App_Web_xzzdzo7a'. Make sure that it is compiled before accessing the page.

Source Error:

Line 1: <%@ page language="VB" masterpagefile="~/phm.master" autoeventwireup="false" inherits="Restricted_Uploading_UploadMenu, App_Web_xzzdzo7a" title="VPhot - Upload Images" enableEventValidation="false" theme="GRAS" %>
Line 2:
Line 3:

Source File: /app/restricted/uploading/Uploadmenu.aspx Line: 1