What does MU_WARNING 24 mean?

Hi, I am trying to run a complex model developed with NM6 some years ago. I'm trying to rerun the model using NM7.2. I get the following messages from NM-TRAN: " (MU_WARNING 24) INTERNAL ERROR IN NMTRAN: UNABLE TO CHECK USE OF MU_ VARIABLES. These warning(s) are considered to be serious errors: 24" With Intel v 11 this then leads to link errors and NONMEM does not run. With the g95 compiler a NONMEM executable is created and NONMEM runs. Question 1: What is the cause of MU_WARNING 24? What does it mean? There are no MU variables declared in the NM-TRAN code. Question 2: What does it mean for a warning to be a serious error? My experience with NONMEM has been that warnings and errors are quite different kinds of messages. Warnings are not necessarily errors. Whlle errors mean execution has to stop. Question 3: Why is there a difference between the way the Intel and g95 compilers deal with this warning/error? Nick -- Nick Holford, Professor Clinical Pharmacology Dept Pharmacology & Clinical Pharmacology, Bldg 503 Room 302A University of Auckland,85 Park Rd,Private Bag 92019,Auckland,New Zealand tel:+64(9)923-6730 fax:+64(9)373-7090 mobile:+64(21)46 23 53 email: [email protected] http://www.fmhs.auckland.ac.nz/sms/pharmacology/holford