seq.int（0，to0-from，by）中的错误：“ to”必须是有限数

Question

这是我的以下Rcode：

wikipediaPage <-"https://en.wikipedia.org/wiki/1500_metres_world_record_progression"
htmlContent <- getURL(wikipediaPage)
result <- readHTMLTable(htmlContent)

tableWR <- readHTMLTable(htmlContent, which = 2, stringsAsFactors = FALSE)

tempTime = as.POSIXlt(tableWR$Time, format = "%M:%OS")

finalTable = data.frame(runTime = (tempTime$min * 60) + tempTime$sec, 
                        recordSet = as.Date(tableWR$Date, format = "%Y-%m-%d"))

p1 <- ggplot(data = finalTable, aes(x = recordSet, y = runTime))
p1 + geom_line()

然后我说一个错误

  

seq.int（0，to0-from，by）中的错误：“ to”必须为有限数字

任何人都可以帮忙吗？