编译nutch2.3 在nutch目录下执行ant runtime 出现如下错误 请问如何解决？谢谢！
gannyee@ubuntu:~/nutch$ ant runtime
Buildfile: /home/gannyee/nutch/build.xml
Trying to override old definition of task javac
ivy-probe-antlib:
ivy-download:
ivy-download-unchecked:
ivy-init-antlib:
ivy-init:
init:
BUILD FAILED
***/home/gannyee/nutch/build.xml:69: Directory /home/gannyee/nutch/build creation was not successful for an unknown reason***
Total time: 5 seconds