thank you for reaching out. It would be easier for us to diagnose and solve the issue if you provide the entire .flair file.
Looking at it, the issue could be the blank entry for “Fudgem” in the PROD-CUT card. Try using 1.0e-5 instead, and let me know if it resolves the issue. If it works, I encourage you to look at this documentation page to set a physically meaningful value for this parameter. If adding this parameter does not work, feel free to attach your entire input file here.