Re: [Swarm-Support] error: TkExtra (instance)

[Bill Northcott]

Here is the same error on MacOS X:
[PBG4-12BN:apps/objc/heatbugs] billn% ./heatbugs 
error: TkExtra (instance)

Abort

How does it happen?  Simple - I shut down the X-server. 

Now this is easy on a Mac which does not use X-windows for its display, 
but rather hard on a Linux box unless you are in CLI mode. 

The only way I could see that you achieve the effect on Linux is if you 
are invoking the program in an environment where DISPLAY is not defined. 
Try 
echo $DISPLAY

You chould get something like 
:0.0
or
localhost:0.0

If you get nothing, try setting the DISPLAY variable.

There could be some other reason that tk cannot create a window on your 
display.  Permissions possibly.

Bill Northcott

address@hidden wrote on 03/10/2003 04:20:18 AM:

> All,

> I've seen this error discussed in the archive, but am having some 
trouble
> finding the solution.

> I've (successfully?) installed swarm on Redhat 9, kernel 2.4.20-18.9, 
with
> gcc 3.2.1.  Using the tutorial to test swarm, all simpleBug's work until
> the gui's are introduced (simpleObserverBug). Then, upon execution I 
get:

> > # ./bug
> > error: TkExtra (instance)
> >
> > Aborted

> sometime during the call to initSwarm.  When I run ldd on the 
executable,
> I get the following information related to Tcl/Tk:

> libtk8.3.so => /usr/lib/libtk8.3.so (0x40324000)
> libtcl8.3.so => /usr/lib/libtcl8.3.so (0x403e2000)
> ...
> libtk8.2.so => /usr/local/lib/libtk8.2.so (0x405b2000)
> libtcl8.2.so => /usr/local/lib/libtcl8.2.so (0x4065d000)

> If anyone has any suggestions, I greatly appreciate it!  One note, I do
> not have root on the system I am working on . . .

> Thanks,
> Matt

> Matthew E. Gaston
> UMBC Department of Computer Science
> address@hidden

> "Only those who attempt the absurd will achieve the impossible."
> -- Einstein
> 
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