Runtime Error: function has more than 60 upvalues

Solar2D General Questions/Discussion
#1

Does any one know why this would happen?

Thanks. [import]uid: 66859 topic_id: 18910 reply_id: 318910[/import]

#2

I recently had a problem like this, i’ll explain what my plight on the matter and you can tell us whether thats similar to your code.

Predeclaring locals. (Outside of functions)

local varName01 = display.newImageRect(...)  
  
--Within the function  
...(However you reference your objects)

And then referencing them within a function, you can only reference 60 upvalues per function.

The way i got around it is to declare these locals in a table like so.

local varTable = {varName01, varName02, varName03 ...}  
  
--Within the function or whatever.  
varTable.varName01 = ... (i.e: display.newImageRect(...))

and then that table only then counts as a single upvalue.

(Of course you can create multiple tables, partitioning your objects.)
I believe thats how it goes.
Sound familiar?
[import]uid: 91798 topic_id: 18910 reply_id: 72844[/import]

#3

I’ve come across more than 60 upvalues errors too, and it happened when I judiciously forward referenced all my variables up top. I used to do so, thinking it was the right thing to do. But then, when I googled “more than 60 upvalues”, I found all sorts of good information that I’ve never knew about.

The bottom line is, I learned it’s not always a good idea to keep all variables forward referenced up top, but do it a bit more consciously and selectively.

Try googling the phrase. I learned so much doing so. And learning about the concept of scope in programming will help quite a bit too.

There are some wonderful blog posts, etc., that I’ve come across while on forum regarding this. If I can dig them up, I’ll post the link(s) (and others might already have them handy).

Naomi [import]uid: 67217 topic_id: 18910 reply_id: 72848[/import]

#4

Here are a couple of links:

http://developer.anscamobile.com/forum/2011/10/14/understanding-scope-blog-post

http://developer.anscamobile.com/forum/2011/09/30/modules-and-scope-variables#comment-58306

Edit: a couple more from googling:

http://lua-users.org/lists/lua-l/2008-08/msg00488.html

http://wow.incgamers.com/forums/showthread.php?t=414407
(scroll down to a post by the user named Telic)

Naomi
[import]uid: 67217 topic_id: 18910 reply_id: 72850[/import]

#5

@thehivetyrant: That is it! Thanks!

@Naomi: Thank you for the resources :slight_smile:

[import]uid: 66859 topic_id: 18910 reply_id: 72864[/import]