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digitalmars.D.learn - Error: conflicting Ddoc and obj generation options

I'm newbie for D.

I have tried build with custom library but the build is failed.

ubuntu 9ffb916910cd:~/dshttpd$ dub
Building configuration "application", build type debug
Compiling...
Error: conflicting Ddoc and obj generation options
Error: DMD compile run failed with exit code 1

What's means "Error: conflicting Ddoc and obj generation options" 
?

Thanks for read.
Dec 25 2013