[BioC] error message relating to png file when running maQualityPlots

[Yanqing Hu [guest]]

I'm using Rstudio on my Mac. When I ran the code maQualityPlots(beta7) in Chapter 4 of Bioinformatics and Computational Biology Solutions Using R and Bioconductor, I got the mesasge "Error in plot.new() : could not open file 'diagPlot.6Hs.195.1.png'". Does anyone know how to fix this problem? Thanks a lot!

 -- output of sessionInfo(): 

R version 2.15.1 (2012-06-22)
Platform: x86_64-redhat-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=C                 LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods  
[7] base     

other attached packages:
 [1] vsn_3.26.0            arrayQuality_1.36.0   beta7_1.0.4          
 [4] marray_1.36.0         cluster_1.14.2        BiocInstaller_1.8.2  
 [7] affycomp_1.34.0       affyPLM_1.34.0        preprocessCore_1.20.0
[10] gcrma_2.30.0          hgu133acdf_2.11.0     hgu95av2cdf_2.11.0   
[13] AnnotationDbi_1.20.0  affydata_1.11.17      affy_1.36.0          
[16] Biobase_2.18.0        BiocGenerics_0.4.0    class_7.3-5          
[19] limma_3.14.3         

loaded via a namespace (and not attached):
 [1] affyio_1.26.0      Biostrings_2.26.1  DBI_0.2-5         
 [4] grid_2.15.1        gridBase_0.4-5     hexbin_1.26.0     
 [7] IRanges_1.16.2     lattice_0.20-10    parallel_2.15.1   
[10] RColorBrewer_1.0-5 RSQLite_0.11.2     splines_2.15.1    
[13] stats4_2.15.1      tools_2.15.1       zlibbioc_1.4.0  

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