Error In Excel Report Services In Share Point 2013. we're sorry. we ran into a problem completing your request

Question

I use SharePoint 2013 and I want use Excel Services Report in Performance Point Service.

I have a SharePoint site that named http://KSCOLAP.

I deployed several report in my site with performance point service.

Now, I want create a Excel Report in performance point service:

I do this like below:

And then

And I config like this (for avoid of any error in my excel I use default sharepoint excel file):

And when I want view this excel file , I get this error in my browser:

we're sorry. 
we ran into a problem completing your request. 
please try that again in a few minutes

I follow all this ways in this link , but I can not fix it ?

Answer 1

I found my fault :

In Central Administration

Go to Application Management

And then in Manage Web Application

I select my web site (Share Point - 80) and then select 'Service Connection'

Finally I Checked Excel Service Application And it work for me.