make sure that you are running with jdk 8 (not 7, 9, 10 or 11). make sure eclipse itself is running on jdk 8 which is hard to see/configure as it's definable in the eclipse.ini file. make sure that the bin directory of jdk 8 is the first in the system path and that the environment variable
java_home points at jdk 8.
assuming none of these panned out...
check if the
theme.res file is in the
src directory. press refresh (f5) and check the physical location on the hard disk.
try creating a different project and see if a
theme.res file is generated there. you can copy it to your project if it is.
assuming that it isn't look at your home directory under the
.codenameone folder. you should see a file called
designer_1.jar. is it there?
does it launch when executed from the command line?
see this for more on tracking such issues https://www.codenameone.com/blog/tip-track-designer-guibuilder-issues.html
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