[Swarm-Support] crash when running: *** event raised for error: InvalidArgument *** function: nil_method()

[phillip paul lucs]

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hi,

i installed swarm as follows,

http://www.philliplucs.net/docs/swarmhowto.html

i then compiled the source code provided by Pepper and Smuts (99), The
evolution of cooperation in an ecological context: An agent-based model as
follows:

http://www.philliplucs.net/docs/peppersmuts99howto.html

i'm finding when a forager is called by a predator the simulation crashes.
i've used gdb to do a backtrace to try and make some sense of it.

(gdb) run
Starting program: /usr/local/src/assign/eco
  numPlants = 256
  worldSize = 36
*** event raised for error: InvalidArgument
*** function: nil_method(), file:
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/defobj/internal.m,
line: 651
The message `drop' was sent to nil.
*** execution terminating due to error
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/defobj/Symbol.m:187
- -[Error(c) _raiseEvent:]

Program received signal SIGABRT, Aborted.
0x406e7741 in kill () from /lib/libc.so.6
(gdb) backtrace
#0  0x406e7741 in kill () from /lib/libc.so.6
#1  0x406e74c5 in raise () from /lib/libc.so.6
#2  0x406e8a08 in abort () from /lib/libc.so.6
#3  0x40280f0b in debugabort (
    filename=0x40212940
"/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/defobj/Symbol.m",
    lineno=187, function=0x40212b1a "-[Error(c) _raiseEvent:]")
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/misc/debugabort.c:9
#4  0x401f621d in -[Error(c) _raiseEvent:] (self=0x8099570,
_cmd=0x40222250, eventData=0x4020b5bf)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/defobj/Symbol.m:187
#5  0x401fd714 in nil_method (receiver=0x0, op=0x805dd60)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/defobj/internal.m:651
#6  0x0804a89f in -[Forager die] (self=0x81c5890, _cmd=0x805dcb0) at
Forager.m:273
#7  0x0804a62e in -[Forager predatorAttack] (self=0x81c5890,
_cmd=0x805dcc0) at Forager.m:243
#8  0x08049b14 in -[Forager step] (self=0x81c5890, _cmd=0x805ef00) at
Forager.m:60
#9  0x4001bddb in L10 () from /usr/lib/swarm/libswarm.so.0
#10 0x081c5890 in ?? ()
#11 0x0805ef00 in _OBJC_SELECTOR_TABLE ()
#12 0x081e4480 in ?? ()
#13 0x401b2e84 in __DTOR_END__ () from /usr/lib/swarm/libactivity.so.5
#14 0x00000002 in ?? ()
#15 0x081e5128 in ?? ()
#16 0xbffff568 in ?? ()
#17 0x40198a5a in -[ActionGroup(c) __performPlan:] (self=0x81f1fb0,
_cmd=0x401abf78)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/CompoundAction.m:176
#18 0x40209120 in objc_call (fa=0x81f1b00)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/defobj/_fcall.m:199
#19 0x401f8712 in -[FCall(c) _performCall] (self=0x81569c8, _cmd=0x401abf90)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/defobj/FCall.m:749
#20 0x40197156 in -[ActionTo(c) __performAction::] (self=0x81564f8,
_cmd=0x401b0fb8, anActivity=0x8156450)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/Action.m:329
#21 0x401a164b in -[Activity(c) __run:] (self=0x8156450, _cmd=0x401b0f90)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/XActivity.m:257
#22 0x401a14fc in -[Activity(c) __run:] (self=0x8155a30, _cmd=0x401b0f90)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/XActivity.m:207
#23 0x401a14fc in -[Activity(c) __run:] (self=0x81f0b90, _cmd=0x401b0f90)
- ---Type <return> to continue, or q <return> to quit---
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/XActivity.m:207
#24 0x401a14fc in -[Activity(c) __run:] (self=0x81f0970, _cmd=0x401b0f90)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/XActivity.m:207
#25 0x401a14fc in -[Activity(c) __run:] (self=0x81f0e00, _cmd=0x401b0f90)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/XActivity.m:207
#26 0x401a14fc in -[Activity(c) __run:] (self=0x81ef908, _cmd=0x401b0f18)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/XActivity.m:207
#27 0x401a127c in -[Activity(c) _run] (self=0x81ef908, _cmd=0x4006a098)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/activity/XActivity.m:93
#28 0x4005b99a in -[ControlPanel startInActivity:] (self=0x81549d0,
_cmd=0x4006a8e0, activityID=0x81ef908)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/simtoolsgui/ControlPanel.m:94
#29 0x4005c444 in -[GUISwarm go] (self=0x814fb00, _cmd=0x805d7e8)
    at
/home/pauljohn/LinuxDownloads/redhat/BUILD/swarm-2.1.140.20020514/src/simtoolsgui/GUISwarm.m:70
#30 0x0804976b in main (argc=1, argv=0x805d7b8) at main.m:32

i'm lost to say the very least on fixing this.

regards,
phillip lucs




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