Lua error when using [unit] tag

[quantumfleet]

I've been writing a scenario where a particular event fires, causing a lot of things to happen, including the spawning of a bunch of reinforcements for side 2. About halfway through, I have the following code:

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#Coded in Wesnoth 1.9.7
           [unit]
            id=Pikeman Leader
            name=_ "Pikeman Leader"
            type=Pikeman
            side=2
            x=30
            y=19
	     [/unit]

The idea being that a unit with an id I can use in messages later on spawns. As far as I can tell, everything prior to that bit functions correctly, but the unit in the above code won't spawn, the rest of the event doesn't work, and I get an error message in the upper right of the screen saying:

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<Lua Error>...(x86)/Battle for Wesnoth 1.9.7/data/lua/wml-tags.lua:140: bad argument #1 to 'add_known_unit' (unknown unit type)
                 stack traceback:
                           [c]: in function 'add_known_unit'
                           ...(x86)/Battle for wesnoth/data/lua/wml_tags.lua:140: in function 'cmd'
                           ...(x86)/Battle for Wesnoth/data/lua/wml-tags.lua:290: in function <...(x86)/Battle for Wesnoth 1.9.7/data/lua/wml-tags.lua:254>

Strangely, the [unit] tag works perfectly everywhere else in the scenario.

What am I doing wrong?

[SigurdFireDragon]

It'd help to have more info, but I'll venture a guess.

based on the error message, I looked at the lua in question and it suggests that you have a [allow_extra_recruit] tag somewhere else in your code. My guess is that you are feeding it "Pikeman Leader" which is the id, not the type of the unit, which is what [allow_extra_recruit] requires

OTOH, this guess might be a bit off.

[quantumfleet]

I do have an [allow_extra_recruit] tag, but misspelled one of the unit id's. Thanks for the help; the reason I didn't post the whole event is because a lot happens in it, all of which now work. Thanks again.

[Anonymissimus]

strategy for such errors:
Look at the stack traceback the error message displays. A stack traceback is a sequence of called functions, that is, actions which are made, which leads to a certain spot in this sequence of actions where the error occurs. It says /data/lua/wml_tags.lua:140 in the first line. Open that file of your BfW installation in a text editor. Line 140 belongs to a long block (no need to understand anything of it, although it helps if you do):

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function wml_actions.some_tag_name(cfg)
...
end

"some_tag_name" is the name of the tag where you probably have made a mistake. (So look it up in the wiki etc.)