This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.
Charles, Since both xw and gf use the X server, make sure your $DISPLAY variable is correctly set and reachable. Also ensure that $GEMEXE is pointing to the correct location. If you upgraded from a previous version, and your path or $GEMEXE is still pointing to the old drivers, that could be a problem Next, if still having trouble, make sure your current working directory doesn't have file or directories with those device driver names that could confuse the search for the driver. Steve Chiswell Unidata User Support >From: "Charles J. Alonge" <address@hidden> >Organization: NASA - Goddard Space Flight Center >Keywords: 200410151633.i9FGXTUE004350 >Hello Support, > > I recently built and installed GEMPAK 5.6.m on a Red Hat Linux >Machine. It compiled completely ( a few minor warnings, but no >errors). Whenever I attempt to run a plotting program such as GDWIND, >GDCNTR, or GDPLOT2, I get the following error: > [GEMPLT -21] NODEVC - Invalid device selected. >I have selected gf and xw and get this message. dev=gif and dev=ps work >fine. >Thanks in advance for all your help. > >Charles > >-- > >Charles J. Alonge >NASA Goddard Space Flight Center - SAIC >Hydrological Sciences Branch >NASA-GSFC Mail Code 974.1 >Greenbelt, MD 20771 > >Office: Building 22, Room 008 >Phone: (301) 286-8272 >Fax: (301) 286-8624 >Email: address@hidden > -- NOTE: All email exchanges with Unidata User Support are recorded in the Unidata inquiry tracking system and then made publicly available through the web. If you do not want to have your interactions made available in this way, you must let us know in each email you send to us.