The mod Developer Assistant (1.0.5) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event developer-assistant::on_player_selected_area (ID 52)
developer-assistant/lib/unpack.lua:14: big data 'dev_cargo-wagon_mini-cargo-wagon-2' not defined!
stack traceback:
[C]: in function 'assert'
developer-assistant/lib/unpack.lua:14: in function 'bigunpack'
developer-assistant/scripts/entity_info.lua:157: in function 'update_entity_details_gui'
developer-assistant/scripts/entity_info.lua:277: in function 'on_player_selected_area'
developer-assistant/scripts/entity_info.lua:286: in function 'handler'
developer-assistant/EventDispatcher.lua:145: in function 'dispatch_event'
developer-assistant/EventDispatcher.lua:39: in function <developer-assistant/EventDispatcher.lua:38>

https://prnt.sc/NdwmGw43QAKv

emmm

do you know the reason ?

unfortunately not. but i can try to describe in more detail what i did
i wanted to build it (as character), but didn't find the recipe anywhere
than i changed into editor mode und place it there. after i did that i wanted to use your tool.