r - Error in prettyDate range too small for min.n in ggplot2 facet chart -

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i have dataset olympics results in athletics. need make facet ggplot different categories, example 100m , marathon subset: 

ath.sub <- subset(ath, event_std%in%c('100m','marathon'))

i got dataframe

> head(ath.sub) event event_std          athlete country result  medal year unit sex       time 1261 100m men      100m       usain bolt     jam   9.69   gold 2008 time men 2011-01-01 1262 100m men      100m   donovan bailey     can   9.84   gold 1996 time men 2011-01-01 1263 100m men      100m    justin gatlin     usa   9.85   gold 2004 time men 2011-01-01 1264 100m men      100m francis obikwelu     por   9.86 silver 2004 time men 2011-01-01 1265 100m men      100m   maurice greene     usa   9.87   gold 2000 time men 2011-01-01 1266 100m men      100m   maurice greene     usa   9.87 bronze 2004 time men 2011-01-01 > tail(ath.sub) event event_std            athlete country  result  medal year unit   sex                time 3370 marathon women  marathon valentina yegorova     rus 2:28.05 silver 1996 time women 2011-01-01 02:28:00 3371 marathon women  marathon       yuko arimori     jpn 2:28.39 bronze 1996 time women 2011-01-01 02:28:00 3372 marathon women  marathon valentina yegorova     urs 2:32:41   gold 1992 time women 2011-01-01 02:32:00 3373 marathon women  marathon       yuko arimori     jpn 2:32:49 silver 1992 time women 2011-01-01 02:32:00 3374 marathon women  marathon    lorraine moller     nzl 2:33.59 bronze 1992 time women 2011-01-01 02:33:00 3375 marathon women  marathon  catherine ndereba     ken    <na> silver 2008 time women                <na> > str(ath.sub) 'data.frame':   236 obs. of  10 variables: $ event    : chr  "100m men" "100m men" "100m men" "100m men" ... $ event_std: chr  "100m" "100m" "100m" "100m" ... $ athlete  : chr  "usain bolt" "donovan bailey" "justin gatlin" "francis obikwelu" ... $ country  : chr  "jam" "can" "usa" "por" ... $ result   : chr  "9.69" "9.84" "9.85" "9.86" ... $ medal    : chr  "gold" "gold" "gold" "silver" ... $ year     : int  2008 1996 2004 2004 2000 2004 1996 2008 1996 2008 ... $ unit     : chr  "time" "time" "time" "time" ... $ sex      : chr  "men" "men" "men" "men" ... $ time     : chr  "2011-01-01 00:00:09.69" "2011-01-01 00:00:09.84" "2011-01-01 00:00:09.85" "2011-01-01 00:00:09.86" ...

then convert time field in posixct

> ath.sub$time<-as.posixct(ath.sub$time,tz = 'gmt') > str(ath.sub$time) posixct[1:236], format: "2011-01-01 00:00:00" "2011-01-01 00:00:00" "2011-01-01 00:00:00" "2011-01-01 00:00:00" ...

as wrote before need make ggplot facet line chart. if choose similar disciplines (like 100m or 400m) i've no problems. different time discipliens 100m , marathon got error

error in prettydate(x = x, n = n, min.n = min.n, sep = sep, ...) :

range small 'min.n'

here ggplot code

gg.ath<- ggplot(ath.sub, aes( year, time, colour=sex))+ facet_wrap(~event_std, scales = 'free')+ scale_y_datetime()+ scale_x_continuous(breaks = ath.sub$year)+ geom_line()+ geom_smooth()

my colleague fixed it, used lubridate package while converting time field

ath.sub$time <- lubridate::ymd_hms(ath.sub$time)

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