I guessed that the csv file is in the current working directory and problems may arise due to the structure of the file, so do not hesitate to come back with any problems you encounter.
It looks like your are just reading the name " "X202007_divvy_tripdata.csv" into the variable adata. You are not reading data into R.
Try
print(adata)
```
to see what I mean.
you need to do something such as
```
adata <- read.csv("X202007_divvy_tripdata.csv")
```
Then to get an idea what is in adata
```
head(adata)
```