make[1]: Leaving directory '/home/liuxg/snappy/desktop/rssreader/parts/rssreader/build/rssreader'
install -m 644 -p /home/liuxg/snappy/desktop/rssreader/parts/rssreader/build/manifest.json /home/liuxg/snappy/desktop/rssreader/parts/rssreader/install/
Preparing to build environment 
Building environment 
Staging rssreader 
Staging environment 
Priming rssreader 
Priming environment 
[Errno 21] Is a directory:
'/home/liuxg/snappy/desktop/rssreader/prime/rssreader'