Running examples in 'stars-Ex.R' failed
The error most likely occurred in:

> base::assign(".ptime", proc.time(), pos = "CheckExEnv")
> ### Name: aggregate.stars
> ### Title: spatially or temporally aggregate stars object
> ### Aliases: aggregate.stars
> 
> ### ** Examples
> 
> # aggregate time dimension in format Date
> tif = system.file("tif/L7_ETMs.tif", package = "stars")
> t1 = as.Date("2018-07-31")
> x = read_stars(c(tif, tif, tif, tif), along = list(time = c(t1, t1+1, t1+2, t1+3)))[,1:30,1:30]
> st_get_dimension_values(x, "time")
[1] "2018-07-31" "2018-08-01" "2018-08-02" "2018-08-03"
> x_agg_time = aggregate(x, by = t1 + c(0, 2, 4), FUN = max) 
> 
> # aggregate time dimension in format Date - interval
> by_t = "2 days"
> x_agg_time2 = aggregate(x, by = by_t, FUN = max) 
> st_get_dimension_values(x_agg_time2, "time")
[1] "2018-07-31" "2018-08-02"
> x_agg_time - x_agg_time2
Warning in FUN(X[[i]], ...) :
  longer object length is not a multiple of shorter object length
stars object with 4 dimensions and 1 attribute
attribute(s):
  L7_ETMs.tif      
 Min.   :-109.000  
 1st Qu.: -13.000  
 Median :   3.000  
 Mean   :   1.896  
 3rd Qu.:  18.000  
 Max.   :  90.000  
 NA's   :5400      
dimension(s):
     from to     offset  delta                       refsys point values    
time    1  3 2018-07-31 2 days                         Date    NA   NULL    
x       1 30     288776   28.5 UTM Zone 25, Southern Hem... FALSE   NULL [x]
y       1 30    9120761  -28.5 UTM Zone 25, Southern Hem... FALSE   NULL [y]
band    1  6         NA     NA                           NA    NA   NULL    
> 
> # aggregate time dimension in format POSIXct
> x = st_set_dimensions(x, 4, values = as.POSIXct(c("2018-07-31", 
+                                                   "2018-08-01", 
+                                                   "2018-08-02", 
+                                                   "2018-08-03")), 
+                       names = "time")
> by_t = as.POSIXct(c("2018-07-31", "2018-08-02"))
> x_agg_posix = aggregate(x, by = by_t, FUN = max)
> st_get_dimension_values(x_agg_posix, "time")
[1] "2018-07-31 CEST" "2018-08-02 CEST"
> x_agg_time - x_agg_posix
Warning in FUN(X[[i]], ...) :
  longer object length is not a multiple of shorter object length
stars object with 4 dimensions and 1 attribute
attribute(s):
  L7_ETMs.tif      
 Min.   :-104.000  
 1st Qu.: -13.000  
 Median :   3.000  
 Mean   :   1.944  
 3rd Qu.:  18.000  
 Max.   :  90.000  
 NA's   :10800     
dimension(s):
     from to     offset  delta                       refsys point values    
time    1  3 2018-07-31 2 days                         Date    NA   NULL    
x       1 30     288776   28.5 UTM Zone 25, Southern Hem... FALSE   NULL [x]
y       1 30    9120761  -28.5 UTM Zone 25, Southern Hem... FALSE   NULL [y]
band    1  6         NA     NA                           NA    NA   NULL    
> aggregate(x, "2 days", mean)
stars object with 4 dimensions and 1 attribute
attribute(s):
  L7_ETMs.tif    
 Min.   : 17.00  
 1st Qu.: 43.00  
 Median : 58.00  
 Mean   : 57.59  
 3rd Qu.: 70.00  
 Max.   :145.00  
dimension(s):
     from to          offset  delta                       refsys point values
time    1  2 2018-07-31 CEST 2 days                      POSIXct    NA   NULL
x       1 30          288776   28.5 UTM Zone 25, Southern Hem... FALSE   NULL
y       1 30         9120761  -28.5 UTM Zone 25, Southern Hem... FALSE   NULL
band    1  6              NA     NA                           NA    NA   NULL
        
time    
x    [x]
y    [y]
band    
> # Spatial aggregation, see https://github.com/r-spatial/stars/issues/299
> prec_file = system.file("nc/test_stageiv_xyt.nc", package = "stars")
> prec = read_ncdf(prec_file, curvilinear = c("lon", "lat"))
Error in read_ncdf(prec_file, curvilinear = c("lon", "lat")) : 
  package ncmeta required, please install it first
Execution halted