Git - remove branch fails

C:\Code\fe\output\dist_inst\var\cache\jquery\clone>git branch -d support.1.6
error: The branch 'support.1.6' is not fully merged.
If you are sure you want to delete it, run 'git branch -D support.1.6'.

C:\Code\fe\output\dist_inst\var\cache\jquery\clone>echo %errorlevel%
1

   [java] com.cenqua.fisheye.config.ConfigException: com.atlassian.utils.process.ProcessExceptio
n: While executing: "git branch -d support.1.6 "
     [java]     at com.atlassian.fisheye.git.GitScanner.removeLocalBranch(GitScanner.java:198)
     [java]     at com.atlassian.fisheye.git.GitScanner.fetchLatest(GitScanner.java:173)
     [java]     at com.atlassian.fisheye.dvcs.DvcsScanner.updateClone(DvcsScanner.java:159)
     [java]     at com.atlassian.fisheye.dvcs.DvcsScanner.updateLocalRepoCache(DvcsScanner.java:14
6)
     [java]     at com.cenqua.fisheye.rep.BaseRepositoryScanner.ping(BaseRepositoryScanner.java:19
4)
     [java]     at com.cenqua.fisheye.rep.BaseRepositoryEngine.doSlurp(BaseRepositoryEngine.java:9
0)
     [java]     at com.cenqua.fisheye.rep.RepositoryEngine.slurp(RepositoryEngine.java:390)
     [java]     at com.cenqua.fisheye.rep.ping.OneOffPingRequest.doRequest(OneOffPingRequest.java:
25)
     [java]     at com.cenqua.fisheye.rep.ping.PingRequest.process(PingRequest.java:66)
     [java]     at com.cenqua.fisheye.rep.RepositoryHandle.processPingRequests(RepositoryHandle.ja
va:132)
     [java]     at com.cenqua.fisheye.rep.RepositoryHandle.queuePingRequest(RepositoryHandle.java:
122)
     [java]     at com.cenqua.fisheye.rep.ping.PingRequest.run(PingRequest.java:33)
     [java]     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:
886)
     [java]     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

     [java]     at java.lang.Thread.run(Thread.java:619)
     [java] Caused by: com.atlassian.utils.process.ProcessException: While executing: "git branch
-d support.1.6 "
     [java]     at com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand(DvcsContext.java:2
27)
     [java]     at com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand(DvcsContext.java:2
19)
     [java]     at com.atlassian.fisheye.git.GitScanner.removeLocalBranch(GitScanner.java:196)
     [java]     ... 14 more
     [java] Caused by: com.atlassian.utils.process.ProcessException: Non-zero exit code: 1
     [java]     at com.atlassian.utils.process.PluggableProcessHandler.complete(PluggableProcessHa
ndler.java:83)
     [java]     at com.atlassian.utils.process.ExternalProcess.finish(ExternalProcess.java:303)
     [java]     at com.atlassian.utils.process.ExternalProcess.execute(ExternalProcess.java:346)
     [java]     at com.atlassian.fisheye.dvcs.client.DvcsContext.executeCommand(DvcsContext.java:2
24)
     [java]     ... 16 more