Error: Discrete value supplied to continuous scale

Hi,

I've this error when I run this cods:
Error: Discrete value supplied to continuous scale

```
ggmap(myMap) +
scale_fill_etopo() +
coord_cartesian(expand = 0) +
labs(y = "Latitude", x = "Longitude") +
theme(legend.position = "none") +
geom_scatterpie(aes(x=Longitude, y=Latitude, group=Country), data=Piedata,
cols=c("Legal", "Illegal"), pie_scale = 1,
sorted_by_radius = FALSE, legend_name = "type",
long_format=FALSE)
```

My data:
Piedata
Country Legal Illegal Latitude Longitude
1 A 0.375 0.625 29.74247 48.41323
2 B 0.852 0.148 27.77500 49.14698
3 C 0.345 0.655 26.31520 50.49300
4 D 0.562 0.439 25.56074 51.64831
5 E 0.410 0.590 25.45679 54.72089
6 F 0.750 0.250 21.11154 59.32937

How can I solve this error
Thanks