Hi! I have a similar problem creating a blueprint. Hope this helps find the error. On Navis, no Bitters ... only using Blueprint-Tool.
The mod Circuit Launchable Rockets (1.3.0) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event CircuitLaunchableRockets::on_player_setup_blueprint (ID 80)
LuaItemStack API call when LuaItemStack was invalid for read.
stack traceback:
[C]: in function 'set_blueprint_entity_tags'
CircuitLaunchableRockets/control.lua:85: in function <CircuitLaunchableRockets/control.lua:73>