<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Hans and everyone else who sent some suggestions,<div class=""><br class=""></div><div class="">Thank you all! My systems is very simple: closed shell H2 +CIS. So I only have 1 reference (the closed shell HF) and I add singles at the CI level. I have been able to create the list using cidrt (I had to play some tricks and manually edit cidrtin but I think I got that part). But ciudg fails. I am asking for 3 states. In the beginning it was failing because I had less references than the number of states I was asking for, but I think I have solved that part using IVMODE=0 and ISTRT=1. Now it is failing but there is no clear error message, so I am not sure why. I suspect that there may still be some inconsistencies between the parameters I manually changed (IVMODE and ISTRT) and other default values ( I do not fully understand all the parameters in ciudg). I have included my compressed directory here. I copied the ciudgls in the main directory since that is the program that fails. Any hint would be greatly appreciated.</div><div class=""><br class=""></div><div class="">Thanks!</div><div class="">Spiridoula</div><div class=""></div></body></html>