realm-swift: Error while installing in cocoapods

Any idea ?

Xcode 6.0.1 cocoapods 0.34.2

Installing Realm (0.86.3)
[!] /bin/bash
set -e
sh build.sh cocoapods-setup

core is not a symlink. Deleting...

Downloading dependency: core 0.84.0

Archive:  /tmp/core_bin/core-0.84.0.zip
replace core/include/tightdb/alloc.hpp? [y]es, [n]o, [A]ll, [N]one, [r]ename:  NULL

(assuming [N]one)

mv: rename /tmp/core_bin/core-0.84.0 to ./core-0.84.0: No such file or directory'