script_manager.lua:427: attempt to concatenate a nil value (local 'category')

[manu-p]

Describe the bug/issue

dt 3.8.1 / Ubuntu 20.04.4

Trying to install and enable script_manager as described here, I get the following error:
script_manager.lua:427: attempt to concatenate a nil value (local 'category')

To Reproduce

1. cd ~/.config/darktable/
2. git clone https://github.com/darktable-org/lua-scripts.git lua
3. echo 'require "tools/script_manager"' > ~/.config/darktable/luarc
4. /usr/bin/darktable -d lua
5. see error message: 5,114164 LUA ERROR : /home/manu/.config/darktable/lua/tools/script_manager.lua:427: attempt to concatenate a nil value (local 'category')
6. dt is running fine, but without script manager

Expected behavior

No error message and script manager enabled in dt.

Platform

• darktable version : 3.8.1-1.1
• OS : Linux
• Linux - Distro : Ubuntu 20.04.4 LTS
• Memory : 14Go
• Graphics card : nVidia GK107GLM [Quadro K1000M]
• Graphics driver : 340
• OpenCL installed : Yes
• OpenCL activated : Yes

[wpferguson]

The easiest way to install the lua scripts is to let darktable do it.

Remove the ~/.config/darktable/luarc file and the ~/.config/darktable/lua directory, then restart darktable and use the lua-scripts installer at the bottom of the left panel in lighttable.

[manu-p]

Thanks @wpferguson, indeed, an old version of luarc and lua folder already existed...