repo同步代碼過程中，提示gpg: Can't check signature: public key not found

object 604e48bf41d9771a6c3082d88e0fe37f2eb275e0
type commit
tag v1.8.2-44
tagger dddd  dddd<[email protected]> 1448694287 +0000

v1.8.2-44

gpg: Signature made Sat 28 Nov 2015 02:04:47 AM EST using RSA key ID 16AB9EC4
gpg: Can't check signature: public key not found
error: could not verify the tag 'v1.8.2-44'

解決辦法：  rm -rf  ~/.repoc*