'Error in (function (cl, name, valueClass) : ‘proj4string’ is not a slot in class “NULL”
I am having error running a buffer function. The "error messages" appears as follow: Error in (function (cl, name, valueClass) : ‘proj4string’ is not a slot in class “NULL”
This is my scipt:
a.x <- cfma[!cfma$No=="NULL",]
## internal buffer to keep all plots within the site boundary
a <- buffer(a.x, width=-120, dissolve=TRUE) #####
## crop Geoville map to the site of interest
b <- crop(lc,a)
## remove NA values from the raster
c <- mask(b,a)
## remove any 0 from the raster
c[c==0] <- NA
...
Please, is there any help?
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