Hello! I have some problems with merging root files with filemerger after using jobsplitter. Sometimes it works, but for some files I get the error "no latest_event_ID histogram - exit!" and no merged file of course. I think the problem is due to the fact that for some runs I get very large root files, so they are divided into many smaller ones. E.g. for two splitted files I get rootOut1_1, rootOut1, rootOut1_2 and rootOut2, rootOut2_1, rootOut2_2, as supposed to only rootOut1 and rootOut2. When using gjm it tries to merge rootOut1 and rootOut2, which I guess don't contain all information since they are only part of the files. Has anyone any experience with this, or knows how to merge these type of files? thanks! Ida PS. I saw similar posts from April 2008 (<a href="http://lists.healthgrid.org/archives/gate-users/2008-April/002647.html">http://lists.healthgrid.org/archives/gate-users/2008-April/002647.html</a>) and Oct 2007 (<a href="http://lists.healthgrid.org/archives/gate-users/2007-October/002110.html">http://lists.healthgrid.org/archives/gate-users/2007-October/002110.html</a>) but I could not get to any scripts or really use anything for myself.