when I connect a constant combinator to a demultiplexer and I left click on the the demultiplexer, the following error message appears:

The mod TriCircuits (0.1.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event TriCircuits::on_gui_opened (ID 84)
TriCircuits/control.lua:173: attempt to index local 'mux' (a nil value)
stack traceback:
TriCircuits/control.lua:173: in function <TriCircuits/control.lua:137>

When I right click on the demultiplexer, another error message pops up:

The mod TriCircuits (0.1.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event TriCircuits::on_player_mined_entity (ID 65)
TriCircuits/control.lua:75: attempt to index field '?' (a nil value)
stack traceback:
TriCircuits/control.lua:75: in function 'on_entity_destroyed'
TriCircuits/control.lua:80: in function <TriCircuits/control.lua:79>

when I cut and paste them, the following error message appears:

The mod TriCircuits (0.1.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event TriCircuits::on_gui_opened (ID 84)
TriCircuits/control.lua:202: attempt to index local 'demux' (a nil value)
stack traceback:
TriCircuits/control.lua:202: in function <TriCircuits/control.lua:137>

to replicate this error:

1. connect a constant combinator to a decomplexer
2. copy and paste them
3. click on the decomplexer and the error message appears.

when I copy and paste the channel combinator and a complexer combinator, and click on it, the following message appears:

The mod TriCircuits (0.1.6) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event TriCircuits::on_gui_opened (ID 84)
TriCircuits/control.lua:173: attempt to index local 'mux' (a nil value)
stack traceback:
TriCircuits/control.lua:173: in function <TriCircuits/control.lua:137>

procedure to replicate this error is same as the previous one.