"An unexpected error occurred: Given index value (0) is too small, allowed values are 1-65536.

Steps to reproduce: setup lab (with prod 1s) in later stage, use stage move tool on earlier stage with right click, get error and labs in earlier stage do not have prods. NOTE: If you remove Prod 1s from later stage, no error.

Log details:
4825.679 Script @bp100/lib/protected-action.lua:13: Protected action: unexpected error occurred:
Given index value (0) is too small, allowed values are from 1 to 65536
stack traceback:
bp100/entity/save-load.lua:43: in function 'createItems'
bp100/entity/save-load.lua:226: in function 'createEntity'
bp100/project/world-updates.lua:119: in function 'updateWorldEntitiesInRange'
bp100/project/world-updates.lua:170: in function 'updateWorldEntities'
bp100/project/project-updates.lua:474: in function 'trySetFirstStage'
bp100/project/user-actions.lua:427: in function 'userBringEntityToStage'
bp100/project/user-actions.lua:443: in function 'fn'
bp100/project/event-handlers.lua:854: in function <bp100/project/event-handlers.lua:844>
(...tail calls...)
bp100/lib/selection-tool.lua:24: in function <bp100/lib/selection-tool.lua:21>
[C]: in function 'xpcall'
bp100/lib/protected-action.lua:17: in function <bp100/lib/protected-action.lua:16>
(...tail calls...)

Actually it doesn't even need labs. Another simple way to reproduce. Start a new map, make a new project, place a single ASM2, add modules to it (spd1 or prod1) and it errors. The modules are NOT set into any subsequent stages - they only remain in the stage you placed them in.

Should be fixed in the latest patch version (v2.1.1).

Thanks for the report!