Openlab Chemstation Report Results - Invalid Calibration Curve error

New, 3 level calibration curve.  Report is not calculating amounts for some compounds.  Displays only zeros.  

One the report at the bottom, there is an error that states: "Invalid Calibration Curve" for those compounds.  This only displays when a sample is run.  When I re-open the data files with the different standard runs, the report calculates the ppm values perfectly.

Any ideas what I am missing?

Thank you

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