Color Zones / Surfaces by EP Result - error



I’m having problem visualizing the EP results. The error: “not possible to convert bytes [F3] to index 0 of code page specified for unicode” keeps showing up for both “Color Zones by EP Result” and “Color Surfaces by EP Result”, even solving warnings.
Could anyone help me?

(I’ve tried to upload my file but I’m a new member and I’m not allowed)