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Here is my code:

ggline(ToothGrowth, x = "dose", y = "len", 
 add = c("mean_se", "jitter"),
 color = "supp", palette = "jco")

Just for reference, ToothGrowth is at the bottom of this question.

My code keeps giving me this plot:

which is the +/- error of all the points, instead of the error bar for each "supp" that I delineated by color. I need it to print something like this:
What am I doing wrong here?

Thank you for the help.

Here is ToothGrowth:

len supp dose
1 4.2 VC 0.5
2 11.5 VC 0.5
3 7.3 VC 0.5
4 5.8 VC 0.5
5 6.4 VC 0.5
6 10.0 VC 0.5
7 11.2 VC 0.5
8 11.2 VC 0.5
9 5.2 VC 0.5
10 7.0 VC 0.5
11 16.5 VC 1
12 16.5 VC 1
13 15.2 VC 1
14 17.3 VC 1
15 22.5 VC 1
16 17.3 VC 1
17 13.6 VC 1
18 14.5 VC 1
19 18.8 VC 1
20 15.5 VC 1
21 23.6 VC 2
22 18.5 VC 2
23 33.9 VC 2
24 25.5 VC 2
25 26.4 VC 2
26 32.5 VC 2
27 26.7 VC 2
28 21.5 VC 2
29 23.3 VC 2
30 29.5 VC 2
31 15.2 OJ 0.5
32 21.5 OJ 0.5
33 17.6 OJ 0.5
34 9.7 OJ 0.5
35 14.5 OJ 0.5
36 10.0 OJ 0.5
37 8.2 OJ 0.5
38 9.4 OJ 0.5
39 16.5 OJ 0.5
40 9.7 OJ 0.5
41 19.7 OJ 1
42 23.3 OJ 1
43 23.6 OJ 1
44 26.4 OJ 1
45 20.0 OJ 1
46 25.2 OJ 1
47 25.8 OJ 1
48 21.2 OJ 1
49 14.5 OJ 1
50 27.3 OJ 1
51 25.5 OJ 2
52 26.4 OJ 2
53 22.4 OJ 2
54 24.5 OJ 2
55 24.8 OJ 2
56 30.9 OJ 2
57 26.4 OJ 2
58 27.3 OJ 2
59 29.4 OJ 2
60 23.0 OJ 2

I've tried your code, and it seems not having problems, as stated also here.
However you can also try to use ggplot2 package:

library(ggsci) # to have the blue and yellow theme
ggplot(ToothGrowth, aes( x = dose, y = len, color = supp, group = supp )) +
geom_jitter()+ # jitter it
 stat_summary(fun.y = mean, # here add the summary, I suppose 
 fun.ymin = function(x) mean(x) - sd(x), # mean and +-sd
 fun.ymax = function(x) mean(x) + sd(x), 
 geom = "errorbar") +
stat_summary(fun.y= function(x) mean(x), geom="line", aes(group = supp))+
stat_summary(fun.y = mean,geom = "point") +
# here you add the line
scale_color_jco()+ # here the colors
theme(panel.background = element_rect(fill = "white", colour = "black")) # you can customize
 # many features with ggplot