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%CRYPTO-4-RECVD_PKT_MAC_ERR: decrypt: mac verify failed

I am receiving the following error when I try to establish an IPSEC tunnel in one of our branch .

*Jan 19 14:16:37.059: %CRYPTO-4-RECVD_PKT_MAC_ERR: decrypt: mac verify failed for connection id=2009 local=172.16.16.6 remote=172.16.16.1 spi=4A4D2438 seqno=000023E2
*Jan 19 14:16:53.627: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 60: Neighbor 172.16.16.1 (FastEthernet0/0) is down: Peer goodbye received
*Jan 19 14:16:55.591: %DUAL-5-NBRCHANGE: IP-EIGRP(0) 60: Neighbor 172.16.16.1 (FastEthernet0/0) is up: new adjacenc

branch is connected with two Wan providers. eigrp is in place in order to switch traffic in case of fail

According to CCO this message means

. %CRYPTO-4-RECVD_PKT_MAC_ERR: decrypt: mac verify failed for connection id=[dec]

The MAC verify processing failed. This may be caused by the use of the wrong key by either party during the MAC
calculations. This activity could be considered a hostile event.


I have checked and double checked the key . It seems OK .

Please , Any ideas what I am doing wrong  ?

Thanks

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