I downloaded a shapefile of the world map from gadm, however, there are typos that happen with importing the shape file. For example "Aland" shows up as "Ã…land" in the shapefile. There are handful of countries I want to make changes to.

world map shapefile, the one that says "You can also download this version as six separate layers (one for each level of subdivision/aggregation), as a geopackage database or as shapefiles" :<https://gadm.org/download_world.html>

I imported the shapefile using:

```
worldmap <- readOGR("file/gadm36_0.shp")

```

I tried using the following code:

```
levels(wordlmap$NAME_0)[5] <- "Aland"

```

However I got this message:

```
Error in `levels<-`(`*tmp*`, value = c(NA, NA, NA, NA, "Aland")) :
  factor level [2] is duplicated

```

Could you suggest how this code can be made better or an alternative.Thanks in advance