Doesn't work reporting services integration

I have a reporting service integration in my SharePoint farm. I never have had any problem until today.

we have changed the sql instance for the SharePoint databases and all work property, but reporting no... I don't understand why because the database of reporting services is in a diferent sql server and this server didn't change, it the same server and the same instance.

I unistalled reporting service application and reinstalled again, but the problem continue.

I use the report above all in PMO and when I want to see the report of one Project I always get this error:

Any help will be appreciated.

Thank you.