SharePoint 2013 - The parameter 'token' cannot be a null or empty string

Question

Hi all,
I am trying to create SharePoint 2013 web app for office 365 using visual studio 2012. when I run the SharePoint web
app then it show the error "the parameter 'token'
cannot be a null or empty string" in the TokenHelper.cs file.
this is the url i'm using: 
$(function () {
$('#exportToExcelBtn').click(function () {
window.location = "https://xx.sharepoint.com/ENPages/_vti_bin/owssvr.dll?CS=109&Using=_layouts/query.iqy&List={803B55DA-B973-4EF4-92ED-F61DFD016D7C}&View={A6282A16-299E-407D-A25A-14E05AB23AE7}&CacheControl=1";
is it good?
I checked that key "clientID" and "cleantSecret" contains values.
what else can it be?

Answer 1

in order to authenticate the app standard token should be submitted along with the url 
check the below url
http://msdn.microsoft.com/en-us/library/office/jj163816(v=office.15).aspx
This combines five other tokens. It initially resolves to SPHostUrl={HostUrl}&SPAppWebUrl={AppWebUrl}&SPLanguage={Language}&SPClientTag={ClientTag}&SPProductNumber={ProductNumber}.
Then each of these tokens resolves. If there is no app web, the portion &SPAppWebUrl={AppWebUrl} is
not present.
Hope that helps|Amr Fouad|MCTS,MCPD sharePoint 2010