Question: How do I change the number of channels in a DAQmx code?

So far I have a control however, I want to make a more user friendly controller and I get the following error if I manually delete one of the channels?  DAQ test is the main VI.
Error -200099 occurred at DAQmx Create Channel (AI-Voltage-Basic)Vi:5
Physical channel not specified.
Attachments:
NI cDAQ.vi ‏111 KB
DAQ test.vi ‏44 KB

At the top of your VI (at least they wound up at the top after I ran block diagram cleanup since the wiring was a mess), there are two subVI's.  Untitled 6.vi and also Relay Off.vi.  The DAQ create channels in one of those subVI's might be causing the problem.
Do you know exactly where the error is generated?  Your error code "Error -200099 occurred at DAQmx Create Channel (AI-Voltage-Basic)Vi:5" tells it is the 5th instance of the DAQmx Create Channel (it is a reentrant subVI).  But I have no way of correlating that with a particular location in your VI's.  Put probes on your error wires and see where the error is actually happening!

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