shapefile - writeOGR error: length(dsn) == 1L is not TRUE

I'm running a for loop R that results in a shapefile being written with each iteration. The for loop runs successfully once, with a shapefile being written out, but then on the second iteration I get this error:

Error in writeOGR(temp, outfile, layer = complete_paste, driver = "ESRI Shapefile",  : 
  length(dsn) == 1L is not TRUE

For some reason, I cannot find any other question encountering this error with writeOGR(). I don't know what it means. Can anyone explain?

If it helps, here's the entire code I'm running. Basically I'm taking a large shapefile, and exporting smaller shapefiles from it by values in shp1$Vector.

library(rgdal)


shp1<- readOGR("/Users/JohnDoe/Desktop/Zone_Fixup/Z1/z1_scrub/z1_merge.shp")


output_path1<- "/Users/JohnDoe/Desktop/Zone_Fixup/Z1/z1_split/"

#Begin for loop to split shapefile by shp1$Vector values
for(i in 1:length(shp1$Vector)){

  #subset by join_id (Vector)
  temp<- shp1[shp1$Vector==shp1$Vector[i],]
  id_paste<- paste(temp$Vector)

  #Create strings for shapefile write-out

  outfile<- paste(output_path1, "Zone1_", id_paste, ".shp", sep = "")
  complete_paste<- paste("Zone1_", id_paste, sep = "")

  #Write out shapefile
  writeOGR(temp, outfile, layer = complete_paste, driver = "ESRI Shapefile", overwrite_layer = TRUE)

}

Answer

As you've confirmed in the comments, id_paste is a vector any time temp has more than one row. This means you'd be sending multiple copies of outfile and complete_paste to writeOGR().

run paste('How do you like them ', c('apples', 'apples', 'apples'), '?', sep = '') to see what happens when you supply a vector to paste().

Try id_paste = shp1$Vector[i] instead.