Error message "MULTIPLE SUBPROBLEMS IS INCOMPATIBLE.."

Using $SIM, I get the following message in OUTPUT (and no output table): 0MULTIPLE SUB_PROBLEMS IS INCOMPATIBLE WITH OTHER INFORMATION IN THE CONTROL STREAM AND INPUT MSF The code snippet is this: $MSFI=../model.msf $SIM (348303) SUBPROBLEMS=10 ONLYSIMULATION TRUE=FINAL The message still occurs if SUBPROBLEMS is set to 1 but disappears if the SUBPROBLEMS bit is taken out (but then only a single simulation is performed). Other than that I use exactly the same control stream that generated the model fit and model.msf, with the blocks $THETA, $OMEGA, $SIGMA, $EST and $COV taken out (and I have other code where this works). Thanks for any pointer, Andreas The information of this email and in any file transmitted with it is strictly confidential and may be legally privileged. It is intended solely for the addressee. If you are not the intended recipient, any copying, distribution or any other use of this email is prohibited and may be unlawful. In such case, you should please notify the sender immediately and destroy this email. The content of this email is not legally binding unless confirmed by letter. Any views expressed in this message are those of the individual sender, except where the message states otherwise and the sender is authorised to state them to be the views of the sender's company. For further information about Actelion please see our website at http://www.actelion.com