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digitalmars.D.learn - Vibe.d throw error with dmd 2.086

dub run gives


The dependency resolution process is taking too long. The 
dependency graph is likely hitting a pathological case in the 
resolution algorithm. Please file a bug report at 
https://github.com/dlang/dub/issues and mention the package 
recipe that reproduces this error.

what is the solution to this problem. i am on windows 10
May 07 2019