Pop Up Warning When Using Math Calculations

I designed a PDF Fillable Form for doing simple math calculations. When the form is not yet filled out, warnings pop up; such as: "The value entered does not match the format of the field [#Cuts1]" and they keep popping up until all the fields are completed with the data needed to perform the calculations. Is there any way to tell the form that it is ok not to have data there? Or to stop the warning popups?