I have been trying to run the following codes from Euler Equations Solver. It is a Lua script that I have been toying with using ZeroBrane Studio. But the project gave the following error every time I try to execute it.
attempt to index global 'Grid' (a nil value)
stack traceback:
...mming Codes\Project 1\Lua Script\Problem 1\Problem 1.lua:7: in main chunk
[C]: at 0x00401b00
I am completely new to Lua and I have been looking for the solutions everywhere. Appreciate any help that I can get.
Related
I am trying to use luasnip.
The configuration I am using is AstroNvim.
The modifications I made to this configuration are :
require("luasnip.loaders.from_snipmate").lazy_load() at the end of init.lua
Made a directory snippets in the same directory of init.lua, and added some basic snipmate styled snippets inside.
Commands Like :LuaSnipListAvailable works well, and snippets from friendly-snippets works well too.
However the following error message pops up when opening neovim.
Error detected while processing /Users/myusername/.config/nvim/init.lua:
E5113: Error while calling lua chunk: ...m/site/pack/packer/start/packer.nvim/lua/packer/load.lua:171: Vim(echomsg):E121: Undefined variable: Error
stack traceback:
[C]: in function 'cmd'
...m/site/pack/packer/start/packer.nvim/lua/packer/load.lua:171: in function <...m/site/pack/packer/start/packer.nvim/lua/packer/load.lua:16
7>
/Users/myusername/.local/share/nvim/packer_compiled.lua:496: in function </Users/myusername/.local/share/nvim/packer_compiled.lua:485>
[C]: in function 'require'
/Users/myusername/.config/nvim/init.lua:23: in main chunk
I tried other methods of adding snippets, but any sort of require("luasnip") seems to break all.
After upgrading my neovim to 0.7.2 I get the following error
Error detected while processing BufWinEnter Autocommands for "*":
E5108: Error executing lua ...pack/paqs/start/LuaSnip/lua/luasnip/loaders/from_lua.lua:97: attempt to call field 'get_load_fts' (a nil value)
stack traceback:
...pack/paqs/start/LuaSnip/lua/luasnip/loaders/from_lua.lua:97: in function '_load_lazy_loaded'
[string ":lua"]:1: in main chunk
E5108: Error executing lua [string ":lua"]:1: attempt to call field '_load_lazy_loaded' (a nil value)
stack traceback:
[string ":lua"]:1: in main chunk
E5108: Error executing lua [string ":lua"]:1: attempt to call field '_load_lazy_loaded' (a nil value)
stack traceback:
[string ":lua"]:1: in main chunk
Help on debugging very welcome!
The error was due to conflicting versions of the plugin, installed via two different plugin managers.
Looking into the different paths in the runtime path (as found with :set rtp) I found different installs and checked their "freshness" with git log.
I removed the folders related to the no longer used plugin manager.
The neovim config files did not really help, rather some lua and git command, but yes, the remark of #Icheylus is usually correct.
loadstring("
\45\45\32\80\117\116\32\115\99\114\105\112\116\32\104\101\114\101\10\112\114\105\110\116\40\34\104\105\34\41\10")()
I keep getting an error stating this:
lua: /tmp/044957038/main.lua:12: attempt to call a nil value (global 'loadstring')
stack traceback:
/tmp/044957038/main.lua:12: in main chunk
[C]: in ?
Can anyone help me? (I’m using glot.io to run my script.)
Based on the comments and some testing in glot, this should work (the print() is just for reference):
print("\45\45\32\80\117\116\32\115\99\114\105\112\116\32\104\101\114\101\10\112\114\105\110\116\40\34\104\105\34\41\10")
load("\45\45\32\80\117\116\32\115\99\114\105\112\116\32\104\101\114\101\10\112\114\105\110\116\40\34\104\105\34\41\10")()
Output
-- Put script here
print("hi")
hi
Hi so I just installed Lua and I have been playing around with it a bit. When I run a program that is supposed to calculate whether an integer is even or odd it throws an error at me.
Program:
function is_even(n)
if bit32.band(n,1) == 0 then
print('Even')
else
print('Odd')
end
end
This is the error that I receive:
stdin:2: attempt to index a nil value (global 'bit32')
stack traceback:
stdin:2: in function 'is_even'
(...tail calls...)
[C]: in ?
What am i doing wrong here? This program is supposed to work on Lua 5.2+ I currently have Lua 5.3.3 installed.
The bit32 library was deleted from Lua 5.3, because it now supports bitwise operators.
I'm using Lua to parse scripts written in some language (let's call it L) and create Lua-code that can be run by e.g. LuaJIT. But to simplify debugging for the users, I want to map the run time errors given by Lua/LuaJIT to the correct line in the L-files. I do this by xpcalling the created Lua-code, translating the error message and stacktrace and then calling error with this message. Unfortunately this gives me two stack traces, one created by me and one tracing back to the function that called error. Is it possible to get rid of this stack trace, or is there some better way of doing this?
local status, err = xpcall(loadedCode, debug.traceback)
if not status then
error(createANewErrorMessageWithPrettyTraceback(err),0)
end
Output:
luajit: ./my/file.name:5: Some error message
stack traceback:
my pretty traceback
stack traceback:
[C]: in function 'error'
./my/file/calling/error.lua:44: in function <./my/file/calling/error.lua:26>
./my-main:16: in main chunk
[C]: at 0x00404180
I know that e.g. Moonscript does something similar to this, but as far as I can see they just write the new error message to stderr and then continues as normal, instead of stopping the program which is what I want to do.
There is a possibility of doing this and then calling error with no arguments, which will make the program fail (actually I think it's error that fails), but this feels like quite an ugly solution, so I'll rather keep the stupid second trace than doing that.
PS: I assume what the title asks actually doesn't work (as error only takes two arguments), so what I'm actually asking is more how something like this can be achieved. (Are there other functions that do similar things perhaps, or where I should look to figure out how to write that function myself.)
Edit: Is it perhaps possible to edit the function that error's using to get its traceback, as it is with debug.traceback?
I wanted to do something similar (only from Lua directly) and I ended up overwriting debug.traceback function itself to change the stack trace to suit my needs. My code is below; see if this method works for you as well:
local dtraceback = debug.traceback
debug.traceback = function (...)
if select('#', ...) >= 1 then
local err, lvl = ...
if err and type(err) ~= 'thread' then
local trace = dtraceback(err, (lvl or 2)+1)
if genv.print == iobase.print then -- no remote redirect
return trace
else
genv.print(trace) -- report the error remotely
return -- don't report locally to avoid double reporting
end
end
end
-- direct call to debug.traceback: return the original.
-- debug.traceback(nil, level) doesn't work in Lua 5.1
-- (http://lua-users.org/lists/lua-l/2011-06/msg00574.html), so
-- simply remove first frame from the stack trace
return (dtraceback(...):gsub("(stack traceback:\n)[^\n]*\n", "%1"))
end
You could simply display the modified traceback that you want and exit.
local function errh(err)
print(createANewErrorMessageWithPrettyTraceback(debug.traceback(err, 2)))
os.exit(-1) -- error code
end
local status, result = xpcall(loadedCode, errh)
-- The script will never reach this point if there is an error.
print(result)