The plugin is failing while running on a linux slave node. I have the "Build Context" set to "helloworld/build". It appears somewhere alone the line that is being translated into "helloworld\build" which is causing issues on the linux agent. See log below.

Plugin version 1.2.2 (latest)
Docker version 1.8.2-el7, build a01dc02/1.8.2
Note that I have a node in a different environment running docker 1.9.1 and I don't encounter this issue.

docker build -t registry/repository/helloworld:v1.0.0 --no-cache=true --pull=true helloworld\build
unable to prepare context: unable to evaluate symlinks in context path: lstat /var/appl/jenkins/workspace/workspace/helloworld\build: no such file or directory
Build step 'Docker Build and Publish' marked build as failure
[BFA] Scanning build for known causes...