For task 10 in this assignment in Learn R

https://www.codecademy.com/courses/learn-r/projects/r-aggregates-shoefly

I’m getting error messages but I don’t know what they mean.

This is my code.

```
# define a_percentage_by_day here:
a_percentage_by_day <- a_clicks_by_day %>%
group_by(day) %>%
mutate(percentage = count/sum(count)) %>%
a_percentage_by_day
# define b_percentage_by_day here:
b_percentage_by_day <- b_clicks_by_day %>%
group_by(day) %>%
mutate(percentage = count/sum(count)) %>%
b_percentage_by_day
```

I get these error messages, I don’t know what they mean. Would somebody please explain this to me? I thought I was following the instructions exactly.

```
Error in a_percentage_by_day(.): could not find function "a_percentage_by_day"
```

```
Error in b_percentage_by_day(.): could not find function "b_percentage_by_day"
```