ggplot problem -> i don't know how to handle this. this isn't like a assignment. i'm studying by myself. Please help me to handle this problem

[Daniel1_1]

str(cities)
'data.frame': 20 obs. of 4 variables:
X : num 1 2 3 4 5 6 28.5 8 9 10 ... long: num 24 25.3 26.4 26.8 27.7 27.6 54.3 28.7 29.2 30.2 ...
lat : chr "55" "54.7" "54.4" "54.3" ... city: chr "Kowno" "Wilna" "Smorgoni" "Moiodexno" ...

str(troops)
'data.frame': 51 obs. of 6 variables:
X : int 1 2 3 4 5 6 7 8 9 10 ... long : num 24 24.5 25.5 26 27 28 28.5 29 30 30.3 ...
lat : num 54.9 55 54.5 54.7 54.8 54.9 55 55.1 55.2 55.3 ... survivors: int 340000 340000 340000 320000 300000 280000 240000 210000 180000 175000 ...
direction: Factor w/ 2 levels "A","R": 1 1 1 1 1 1 1 1 1 1 ... group : Factor w/ 3 levels "1","2","3": 1 1 1 1 1 1 1 1 1 1 ...
str(temps)
'data.frame': 9 obs. of 5 variables:
X : int 1 2 3 4 5 6 7 8 9 long: num 37.6 36 33.2 32 29.2 28.5 27.2 26.7 25.3
temp: int 0 0 -9 -21 -11 -20 -24 -30 -26 days: int 6 6 16 5 10 4 3 5 1
$ date: Factor w/ 8 levels "01-Dec","06-Dec",..: 6 7 4 5 NA 8 1 2 3

when i code this,

ggplot(data = troops, aes(long, lat)) + geom_path(aes(group = group, color = direction, size = survivors), lineend = "round") + scale_size(range = c(0.5,15)) + scale_color_manual(values = c("#DFC17E", "252523")) + xlab("") + ylab("") + guides(color = F, size = F) + geom_text(data = cities, aes(long, lat, label = city))

there' s a error -> Discrete value supplied to continuous scale

I don't know what the problem is.

Help me.

[technocrat]

long and lat are continuous variables, they can take on a theoretically infinite number of variables, but the scale_color_manual arguments only provide for two. See the FAQ: How to do a minimal reproducible example reprex for beginners for tips on presenting questions in a way that can be answered with a concrete example. In the meantime, I've written about thematic maps on color selection for continuous variables, which illustrates the problem.