Qsys component -- conduit_splitter clock setting

I added one more output to an previously 2-output conduit_splitter in Qsys.
I keep getting the error saying the added conduit_output has no associated clock
But I don't see any clock settings available at the conduit_splitter component from the library.

The way I added the output signal is simply change the parameters of output numbers of the conduit_splitter. I didn't modify any of the original design files. And also there are no errors regards the other two output signals.
Aren't all the three output signals supposed to be the same since they are merely splitted from the same signal?

Does anyone have similar problem with conduit_splitter clock settings?

I use Quartus II 13.0, Qsys

Any advice will be appreciated.
Thank you.