Regarding connecting ECP client with Shibboleth

[Peter Schober]

* winma heenatigala <winma2014al at gmail.com> [2018-08-29 05:57]:
> To report this problem, please contact the site administrator at winma at test.
[...]
> No session initiator found with id (ECP), check requireSessionWith command.

That seems pretty clear to me?

> <Location /myservice/>
>   AuthType shibboleth
>   ShibRequestSetting requireSessionWith ECP
>   Require valid-user
> </Location>

For whatever reason (what documentation are you following here?)
you're asking the the software to initiate a session with a named
session initiator, here called "ECP". That name is arbitrary and up to
you, and you don't seem to have such a session initiator defined.

So why are you doing this in the first place?

-peter