When trying to pipette an underground pipe that has been modified by Flow Configuration, I get this error:

The mod Actual Underground Pipes (0.1.11) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event the-one-mod-with-underground-bits::on_player_pipette (ID 108)
Unknown item name: tomwub-pipe-fc-ns
stack traceback:
    [C]: in function '__newindex'
    __the-one-mod-with-underground-bits__/control.lua:56: in function <__the-one-mod-with-underground-bits__/control.lua:35>

Thanks for the report, I'll look into it

Fixed in latest release