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Unable to print results from corners tool

I am using the corners tool in 5.10.41.500.6.147 and I have the following two expressions in the "Performance measurements" section:

myfft: (thfft = dB20(dft(VT("/voutdiff_tend") 6e-09 (6e-09 + (256 / VAR("fs_2nd"))) 256 "Rectangular" 1 dftCoherentGain("Rectangular" 1))))

myim3: (value(thfft VAR("im3high")) - value(thfft VAR("sigFin")))

Note: sigFin, fs_2nd, im3high are design variables in my ADE setup.

If I select the "print" check box and click on "Plot/Print" button I get the following error in the CIW windows:

Invalid expression for Corners print: (value(thfft VAR("im3low")) - value(thfft VAR("sigFin")))

And the results do not print out. However. if I have the "plot" check box selected I do get the plot of the results.

How can I get the data to print out as normal?

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