# How to Fix: aesthetics must be either length 1 or the same as the data

One error you may encounter in R is:

```Error: Aesthetics must be either length 1 or the same as the data (5): fill
```

This error occurs when you attempt to specify the fill colors to use in a ggplot2 plot, yet the number of colors you specified is different than 1 or different than the total number of objects to be filled.

The following example shows how to fix this error in practice.

### How to Reproduce the Error

Suppose we’re working with the built-in R dataset called airquality:

```#view first six lines of airquality dataset

Ozone Solar.R Wind Temp Month Day
1    41     190  7.4   67     5   1
2    36     118  8.0   72     5   2
3    12     149 12.6   74     5   3
4    18     313 11.5   62     5   4
5    NA      NA 14.3   56     5   5
6    28      NA 14.9   66     5   6
```

Now suppose we attempt to create multiple boxplots to visualize the distribution of Ozone values for each Month:

```library(ggplot2)

#attempt to create multiple boxplots
ggplot(data = airquality, aes(x=as.character(Month), y=Temp)) +
geom_boxplot(fill=c('steelblue', 'red'))

Error: Aesthetics must be either length 1 or the same as the data (5): fill
```

We receive an error because there are 5 unique Months in the dataset (thus, we will create 5 boxplots) but we only supplied two colors to the fill argument.

### How to Fix the Error

There are two ways to fix this error:

Method 1: Only Use One Color in Fill Argument

We could choose to use just one color in the fill argument:

```library(ggplot2)
ggplot(data = airquality, aes(x=as.character(Month), y=Temp)) +
geom_boxplot(fill=c('steelblue'))
``` This allows us to fill in each boxplot with the same color.

Method 2: Use the Same Number of Colors as the Number of Boxplots

We could also specify five colors to use since this matches the number of boxplots we will create:

```library(ggplot2)
ggplot(data = airquality, aes(x=as.character(Month), y=Temp)) +
geom_boxplot(fill=c('steelblue', 'red', 'purple', 'green', 'orange'))``` We don’t receive and error because the number of colors we supplied matches the number of boxplots.