Error while running event enemyracemanager::on_init()
The mod AAI Signal Transmission (0.5.0) caused an unrecoverable error.
Please report this error to the author of the Mod.

Error while running event aai-signal-transmission::on_force_created (ID 33)
The mod Recipe Book (4.0.1) caused an unrecoverable error.
Please report this error to the author of the Mod.

Error while running event RecipeBook::on_surface_created (ID 67)
RecipeBook/scripts/database/researched.lua:126: bad argument #1 of 2 to 'pairs' (table expected, got nil)
stack traceback:
[C]: in function 'pairs'
RecipeBook/scripts/database/researched.lua:126: in function 'research_surface'
RecipeBook/scripts/database/researched.lua:155: in function 'handler'
core/lualib/event_handler.lua:47: in function <core/lualib/event_handler.lua:45>
stack traceback:
[C]: in function 'create_surface'
aai-signal-transmission/control.lua:440: in function 'get_surface'
aai-signal-transmission/control.lua:452: in function <aai-signal-transmission/control.lua:450>
stack traceback:
[C]: in function 'create_force'
enemyracemanager/controllers/initializer.lua:38: in function 'createRace'
enemyracemanager/controllers/initializer.lua:270: in function 'on_init'
core/lualib/event_handler.lua:69: in function <core/lualib/event_handler.lua:64>

The issue is on RecipeBook.

RecipeBook/scripts/database/researched.lua:126: bad argument #1 of 2 to 'pairs' (table expected, got nil)

Alright. Thanks for your guidance.