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Error in readChar(con, 5L, useBytes = TRUE) : cannot open the connection

The 'mow.R' now contains:

png(filename="RgoogleMaps-package_%03d_med.png", width=480, height=480);
MyMap <- GetMap(markers='&40.702147,-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc', destfile="MyTile1.png");

This results in the following new error:

> source('mow.R')
[1] "Note that when center and zoom are not specified, no meta information on the map tile can be stored. This basically means that R cannot compute proper coordinates. You can still download the map tile and view it in R but overlays are not possible. Do you want to proceed ? (y/n)"
[1] "&40.702147,-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc"
[1] ",-74.015794,blues%7C40.711614,-74.012318,greeng%7C40.718217,-73.998284,redc"
Error in readChar(con, 5L, useBytes = TRUE) : cannot open the connection
In addition: Warning message:
In readChar(con, 5L, useBytes = TRUE) :
  cannot open compressed file 'MyTile1.png.rda', probable reason 'No such file or directory'

What's the way to correct this error?

R version 2.15.1

RgoogleMaps version 1.2.0

> sessionInfo() 
R version 2.15.1 (2012-06-22)
Platform: x86_64-unknown-linux-gnu (64-bit)
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     
other attached packages:
[1] RgoogleMaps_1.2.0 png_0.1-4