Error in grid.Call.graphics(C_unsetviewport, as.integer(n))

Question

[jiamin_2010]

i run this :

library("motifbreakR")
library(BSgenome.Hsapiens.UCSC.hg19)


data(example.results)
#pdf("motifbreak_test.pdf",family="GB1")
plotMB(example.results, "rs2661839", effect = "strong")
#dev.off()

but it error

Warning message:
In .local(GdObject, ...) :
  There have been errors in the detail plotting function:
Error in PostScriptTrace(ps.file, paste0(ps.file, ".xml")) : 
  status 127 in running command '"C:\Program Files\gs\gs9.06\bin\gswin32c.exe" -q -dBATCH -dNOPAUSE -dNOSAFER -sDEVICE=ps2write -sOutputFile=C:\Users\jasmine\AppData\Local\Temp\RtmpOqekFf\file9582b76430 -sstdout=C:\Users\jasmine\AppData\Local\Temp\RtmpOqekFf/stack.ps.xml C:\Users\jasmine\AppData\Local\Temp\RtmpOqekFf\file95810bd539a.ps'


Error in grid.Call.graphics(C_unsetviewport, as.integer(n)) : 
  无法弹到最上层的視窗('grid'和'graphics'输出有混合？)

what can i do ?