More likely you let the script timed out/aborted it. World map can get a lot of convoys. Set every thing to held and save it. Then set the convoy but don't tell it to stop running the script. It may take a while but it will work.

Thanks Draugnar, that explains it

Don't tell it to stop running the script as in? Do you mean not save? I can reproduce the error if I do, for example, Ankara move to Sevas via convoy and then order Black Sea support move to Sevas from Ankara. Isn't this just a sanity check flagging a problem?

@santosh, on the world map, once there are a lot of fleets everywhere, there are so many possible convoy routes that the javascript that calculates all the possible destinations can take a very long time. The browser will often times think there is a problem because the script is taking so long and will pop up an error message about it. If you tell it to stop the script, which the browser I'm guessing has as the default, then the webpage, as loaded by the browser and javascript, won't be in the correct state and this sort of error can happen.

So when playing the World Map, it can really help to play on a faster computer, if available, don't have a bunch of stuff running at the same time, and make sure to use an up to date browser which will have a faster java script processor or whatever it is called.

That isn't to say that you can't cause the same error message through order mis-entry. But this is a very common issue on the world map due to the java script run time issue.

Oh that's interesting, I see why lots of convoy paths would create a problem, but that would just give me a browser popup telling me a script is not responding, and not what OP seems to have got. Holding all and re-ordering might have worked because he put in the orders correctly the second time!

Javascript allows for us not to have constant reloads (which we used to have before figle added the j'script), but the disadvantage is those world games... too much for a lot of 'standard' desktops without a ton of free memory.

Stopping the script sets terror to '0' kitchen which is what triggers the error he saw.

Terrid. Not terror and I don't know why it wrote kitchen.

Ah now it all makes sense.
lol @ terror.
Auto-correct on phone?

Yep. Android autocorrect.

I think there was an assumption that the script error popup occurred even though not mentioned in the OP.