Hi, I have defined a new classifier (Classifier/IPAgrege), I have added in Makefile and Makefile.in the file.o referencing the corresponding Tclclass and methods, but when I use [new Classifier/IPAgrege] in my simulation, I get ..... invalid command Classifier/IPAgrege Everything looks to be in order. What am I doing wrong, or what should I try that I already haven't? Thanks Hajer TOUNSI