Join merge problem into Pentaho Server

Hi everyone ;

i'm new in Pentaho, i use Pentaho CE 6.1.0.1 with PDI same version, i tried to schudle jobs and transformations into Pentaho Server , when i execute a transformation which contains Join Merge component (in PDI) it's doesn't work (and when i run it in PDI GUI Spoon it work perfectly) .

In Tomcat logs i had this ERROR : Join.0 - ERROR (version 6.1.0.1-196, build 1 from 2016-04-07 12.08.49 by buildguy) : Two streams must be submitted no more, no less.


It's weird because i have just 2 streams, ranged and works perfectly in PDI GUI Spoon.

Any one have this problem ? or any idea to solve it.

Thank you ;