68173.132 Error MainLoop.cpp:1202: Exception at tick 140740235: The mod Friend Blueprints caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FriendBlueprints::on_player_selected_area (ID 49)
Entity is not valid for blueprint: railloader-universal-inserter
stack traceback:
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>
stack traceback:
[C]: in function 'set_blueprint_entities'
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>
68173.132 Error ServerMultiplayerManager.cpp:92: MultiplayerManager failed: "The mod Friend Blueprints caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FriendBlueprints::on_player_selected_area (ID 49)
Entity is not valid for blueprint: railloader-universal-inserter
stack traceback:
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>
stack traceback:
[C]: in function 'set_blueprint_entities'
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>"

223.266 Error MainLoop.cpp:1202: Exception at tick 140750872: The mod Friend Blueprints caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FriendBlueprints::on_player_selected_area (ID 49)
Entity is not valid for blueprint: miniloader-target-chest
stack traceback:
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>
stack traceback:
[C]: in function 'set_blueprint_entities'
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>
223.266 Error ServerMultiplayerManager.cpp:92: MultiplayerManager failed: "The mod Friend Blueprints caused a non-recoverable error.
Please report this error to the mod author.

Error while running event FriendBlueprints::on_player_selected_area (ID 49)
Entity is not valid for blueprint: miniloader-target-chest
stack traceback:
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>
stack traceback:
[C]: in function 'set_blueprint_entities'
FriendBlueprints/control.lua:47: in function <FriendBlueprints/control.lua:2>"

Thanks for the report, I will look into it

I have a partial fix, v1.0.2 is available for download and will no longer cause a crash. But there is still a mod incompatibility with Bulk Rail Loaders. That mod has coded some special handling that runs when a regular blueprint is created, and unfortunately that code doesn't run when Friend Blueprints creates a blueprint. This causes blueprints made by Friend Blueprints to be created with a weird placeholder for Bulk Rail Loaders and Bulk Rail Unloaders. The blueprint can still be stamped, but because of the placeholder issue, no ghosts are created for the bulk loader/unloader entities. I'm still looking into how to resolve this.

wonder if you can ask therax for a remote interface.