ls() will show the objects in namespace; that will confirm that the message in the screenshot is correct. See also the upper right hand quadrant: "Global environment is empty." That indicates that nothing at all has been loaded.
When the "StudentSurvey" object has been loaded, use
str(StudentSurvey)
to see what types of variable are contained. Only numeric variables can be plotted as histograms.
An alternative display is provided by stem
stem(mtcars$mpg)
#>
#> The decimal point is at the |
#>
#> 10 | 44
#> 12 | 3
#> 14 | 3702258
#> 16 | 438
#> 18 | 17227
#> 20 | 00445
#> 22 | 88
#> 24 | 4
#> 26 | 03
#> 28 |
#> 30 | 44
#> 32 | 49
Created on 2020-09-18 by the reprex package (v0.3.0)