unable to start device PNG

I am using version 3.5.0 with support for JPEG, PNG, TIFF, and other graphics formats:

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[Previously saved workspace restored]

capabilities() jpeg png tiff tcltk X11 aqua TRUE TRUE TRUE TRUE FALSE FALSE http/ftp sockets libxml fifo cledit iconv TRUE TRUE TRUE TRUE TRUE TRUE NLS profmem cairo ICU long.double libcurl TRUE FALSE TRUE FALSE TRUE TRUE

Running the following RepEx2 command "seqclust --tarean_mode LAS****.fas" produces and error:

... loading blast results loading blast results loading blast results creating graph creating graph graph layout calculation using OGDF & frucherman reingold graph layout calculation using OGDF & frucherman reingold exporting graph figureError in .External2(C_X11, paste0("png::", filename), g$width, g$height, : unable to start device PNG In addition: Warning message: In png(image_file, width = 900, height = 900, pointsize = 20) : unable to open connection to X11 display '' Process 58: Traceback (most recent call last): File "/sysapps/cluster/software/Anaconda/2.3.0Linux-x86_64/envs/2016-Q3-Python-3.5/lib/python3.5/site-packages/pyRserve/rparser.py", line 448, in parse rserve_err_msg = ERRORS[self.lexer.errCode] KeyError: 127

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/sysapps/cluster/software/Anaconda/2.3.0Linux-x86_64/envs/2016-Q3-Python-3.5/lib/python3.5/site-packages/pyRserve/rconn.py", line 170, in eval message = rparse(src, atomicArray=atomicArray) File "/sysapps/cluster/software/Anaconda/2.3.0Linux-x86_64/envs/2016-Q3-Python-3.5/lib/python3.5/site-packages/pyRserve/rparser.py", line 640, in rparse return rparser.parse() File "/sysapps/cluster/software/Anaconda/2.3.0Linux-x86_64/envs/2016-Q3-Python-3.5/lib/python3.5/site-packages/pyRserve/rparser.py", line 451, in parse self.lexer.errCode) pyRserve.rexceptions.REvalError: R evaluation error (code=127)

This command: "pip list | grep pyRserve" gives "pyRserve 0.9.1"

X11 works from inside R, so I assume it should NOT be a problem... Do you have any suggestions on how to fix this error? Thank you!

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