Error occures with 'saveExec = TRUE'

[shangzhi-hong]

Using the latest build of MultiBUGS with the latest R2MultiBUGS
When run with 'saveExec = TRUE', the following message appears in the MultiBUGS window:

TRAP 99  (postcondition violated)

 BugsSerialize.Externalize   [0000053EH] 
	.f	Files.File	[02B5D570H] 
	.fileName	ARRAY 1024 OF CHAR	"D:/TrialRun/SLR/bugs_model.bug"   ...
	.offsetGraph	INTEGER	1152
	.offsetMonitor	INTEGER	6137
	.offsetMutable	INTEGER	5281
	.pos	INTEGER	0
	.res	INTEGER	1
	.wr	Stores.Writer	fields
 BugsCmds.ExternalizeModel   [00002835H] 
	.fileName	ARRAY 1024 OF CHAR	"D:/TrialRun/SLR/bugs_model.bug"   ...
 BugsInterpreter.CmdInterpreter   [000003C1H] 
	.boolCmd	BugsInterpreter.RECORD	fields
	.cmd	BugsInterpreter.RECORD	fields
	.command	ARRAY 1024 OF CHAR	"BugsCmds UpdateGuard  BugsCmds E"   ...
	.guard	BugsInterpreter.RECORD	fields
	.intCmd	BugsInterpreter.RECORD	fields
	.item	Meta.Item	fields
	.item0	Meta.Item	fields
	.item1	Meta.Item	fields
	.ok	BOOLEAN	TRUE
	.realCmd	BugsInterpreter.RECORD	fields
	.res	INTEGER	0
	.s	BugsMappers.Scanner	fields
	.string	ARRAY 1024 OF CHAR	"BugsCmds UpdateGuard  BugsCmds E"   ...
	.stringCmd	BugsInterpreter.RECORD	fields
 BugsScripting.Script   [000005BCH] 
	.bugsCommand	ARRAY 1024 OF CHAR	"modelExternalize(s)"   ...
	.i	INTEGER	1
	.numPar	INTEGER	1
	.p	ARRAY 10, 1024 OF CHAR	elements
	.pascalCommand	ARRAY 1024 OF CHAR	"BugsCmds.UpdateGuard; BugsCmds.E"   ...
	.pat	ARRAY 1024 OF CHAR	"^0"   ...
	.pos	INTEGER	-1
	.pos1	INTEGER	18
	.res	INTEGER	0
	.s	BugsMappers.Scanner	fields
 BugsCmds.ScriptAction.Do   [000011A5H] 
	.a	BugsCmds.ScriptAction	[02D0EAB0H] 
	.res	INTEGER	0
 Services.Exec   [00000140H] 
	.a	Services.Action	[02D0EAB0H] 
	.t	POINTER	[68280BB0H]
 Services.IterateOverActions   [000002F2H] 
	.p	Services.Action	[02D0EAB0H] 
	.time	LONGINT	88027687
 Services.StdHook.Step   [0000034BH] 
	.h	Services.StdHook	[02B75A00H] 
 HostWindows.Idle   [000049DBH] 
	.focus	BOOLEAN	FALSE
	.tick	Controllers.TickMsg	fields
	.w	HostWindows.Window	NIL
 HostMenus.TimerTick   [00003675H] 
	.lParam	INTEGER	0
	.ops	Controllers.PollOpsMsg	fields
	.wParam	INTEGER	1
	.wnd	INTEGER	394252
 Kernel.Try   [000045F9H] 
	.a	INTEGER	394252
	.b	INTEGER	1
	.c	INTEGER	0
	.h	PROCEDURE	HostMenus.TimerTick
 HostMenus.ApplWinHandler   [00003A40H] 
	.Proc	PROCEDURE	NIL
	.hit	BOOLEAN	FALSE
	.lParam	INTEGER	0
	.message	INTEGER	275
	.res	INTEGER	0
	.s	ARRAY 256 OF CHAR	"?c????"   ...
	.w	INTEGER	63
	.wParam	INTEGER	1
	.wnd	INTEGER	394252
<system>   (pc=7717BE6AH,  fp=0063FCB0H)
<system>   (pc=77178339H,  fp=0063FD98H)
<system>   (pc=77177BEDH,  fp=0063FE14H)
<system>   (pc=771779CFH,  fp=0063FE20H)
 HostMenus.Loop   [00003DDDH] 
	.done	BOOLEAN	FALSE
	.f	SET	{0..5}
	.n	INTEGER	0
	.res	INTEGER	0
	.w	HostWindows.Window	NIL
 Kernel.Start   [000036E3H] 
	.code	PROCEDURE	HostMenus.Loop