Error In proj4string

Hi list!

I have been trying to run some code that I have run tons of times 
before, only to get a warning message:

##add in ASCII raster maps bio1-11

bio1 <- readGDAL("bio1.asc")

bio1.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio2 <- readGDAL("bio2.asc")

bio2.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio3 <- readGDAL("bio3.asc")

bio3.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio4 <- readGDAL("bio4.asc")

bio4.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio5 <- readGDAL("bio5.asc")

bio5.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio6 <- readGDAL("bio6.asc")

bio6.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio7 <- readGDAL("bio7.asc")

bio7.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio8 <- readGDAL("bio8.asc")

bio8.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio9 <- readGDAL("bio9.asc")

bio9.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio10 <- readGDAL("bio10.asc")

bio10.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns

bio11 <- readGDAL("bio11.asc")

bio11.asc has GDAL driver AAIGrid
and has 1486 rows and 1347 columns
###combine raster maps

temp <- cbind("bio1", "bio2", "bio3", 

"bio4","bio5","bio6","bio7","bio8","bio9","bio10","bio11")

names(temp) <- c("bio1", "bio2", "bio3", 

"bio4","bio5","bio6","bio7","bio8","bio9","bio10","bio11")
###read in point file lin.shp

lin <- readShapePoints("lin.shp")

###set proj4strings to the same proj4string: *this is where the issue is*

proj4string(lin)= proj4string(temp)

*Error in (function (classes, fdef, mtable)  :
  unable to find an inherited method for function ?proj4string? for 
signature ?"matrix"?*
###what is in "temp" ?

temp

     [,1]   [,2]   [,3]   [,4]   [,5]   [,6]   [,7]   [,8]   [,9]   
[,10]   [,11]
[1,] "bio1" "bio2" "bio3" "bio4" "bio5" "bio6" "bio7" "bio8" "bio9" 
"bio10" "bio11"
attr(,"names")
 [1] "bio1"  "bio2"  "bio3"  "bio4"  "bio5"  "bio6"  "bio7"  "bio8" 
 "bio9"  "bio10" "bio11"

class(temp)

[1] "character"
###end

I am not sure why this issue is occurring.
I have checked all the projections - all files are in the same 
projection.
I have restarted R - nothing gets better.
I have tried data for a different organism (it is the same data, but 
belonging to a different species) - this does not work.
I have the following packages loaded:
library(maptools)
library(adehabitatHS)
library(SDMTools)
library(spatial)
library(sp)
library(rgdal)
library(dismo)
library(shapefiles)


Thanks, List!







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