NaN as Output Data points

Dear friends,
i have written a resistivty program using ke224 current source, ke2182a nano voltmeter and lakeshore325 temperature controller,
the program is running fine, data points are being written to spreadsheet,
but the data point on x-axis is 0000 and on y axis is NaN,
also i am getting an error6 at LSC325,
can you friends please figure out wher i am stucked?
thnaks in adavance

My first suggestion would to break down the task into chunks and turn these chunks into subVIs. Try to make these tasks reusable if possible (ei used in multiple places). As it stands, I can't figure out what is happening in your VI.
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