SDK / getting "bad header in precompiled chunk" for my scripts.

[C.Cella]

I have downloaded the latest lua here: https://www.lua.org/download.html

Initialled on my Mac and all is fine.

I then wanted to obfuscate my code so I need to compile the scripts.

I do

 luac -o CompiledScriptName.lua ScriptName.lua

All seems to be ok, the new compiled file is created no issues...but then I get this error whenever I run the script in LrC.

NameOfScript.lua: bad header in precompiled chunk

Don't know what I am doing wrong here.

Any help would be appreciated.

[johnrellis · Accepted solution]

That downloaded "luac" is version 5.4.6, while LR requires 5.1.  Use the "luac" stored in the SDK subfolder "Lua Compiler/{mac,win}".  I don't think that's documented anywhere.

[C.Cella]

Ok, I will uninstall 5.4.6 and install the one that comes with the SDK.

.

[C.Cella]

I have uninstalled lua 5.4.6

Now I don't understand how to install the luac I have in the SDK

There is no make.

I went to the Lua Binaries and I get this error when I want to download 5.1.5

The "/5.1.5/Tools Executa..MacOS1011_bin.tar.gz" file could not be found or is not available. Please select another file.

.

[johnrellis · Accepted solution]

Oh, I see it's a little geeky to install:

1. Download or re-download the Lightroom Classic SDK from here:

https://developer.adobe.com/console/servicesandapis

and unzip it. 

2. In Terminal, do these commands:

cd /Users/john/Downloads/LrC_13.2_202402141005-bf1aeb84.release_SDK/Lua\ Compiler/mac
chmod +x luac
xattr -r -d com.apple.quarantine luac
cp luac /usr/local/bin

replacing the path in the first line with the path of where you downloaded the SDK.

[C.Cella]

@johnrellis

Thanks a million.
 I get permission denied but I used 

sudo cp luac /usr/local/bin

Now the compiling of my scripts is successful.

The SDK documentation has nothing on this, even worse the very latest documentation even suggests

luac53.exe can be used...ergo my total confusion and why I dowloaded 5.4.6

.