Simulation error

Dear All, I am trying to run a simulation using $MSFI option instead of giving $THETA and $OMEGA. One of the model gave the following error and a recommendation: F_LVR AND/OR F_LTH ARE TOO SMALL TO DEAL WITH INPUT FROM MSFI FILE. RECOMMEND INSERTING AS FIRST LINE OF CONTROL STREAM: $SIZES LTH= 7 LVR= 2. I changed the control file with the recommended $SIZES LTH= 7 LVR= 2 as first line in the control file. But, then I get the following error message: WARNING: EXTRA MSF FILE COULD NOT BE OPENED: msf2_ETAS *** Error in `./nonmem': malloc(): memory corruption: 0x000000000400f470 *** I appreciate any help resolving this issue. Regards, Ayyappa