Error: Unable to locate a SAML 2.0 ACS endpoint to use for response

[Peter Schober]

* aivanov100 <alex at calmforce.com> [2016-09-26 05:10]:
> We are now running the latest stable version of the Shibboleth SP
> (2.5.6)

FYI, from the Shibboleth 2 wiki home page:
https://wiki.shibboleth.net/confluence/display/SHIB2/

  "The current stable release of the Service Provider(SP) is
   2.6.0. There are no previous stable releases at this time."

Best regards,
-peter