cannot decrypt WPA2-PSK

Hi all,

I'm running 1.12.2 and trying to decrypt 802.11 WPA2 Personal. Under IEEE 802.11 protocol of Edit -> Preferences, I chosen the Key type as wpa-psk, input the Key (generated here https://www.wireshark.org/tools/wpa-psk.html) and check marked the "Enable decryption" checkbox. After clicking Apply, I still see Data shown under IEEE 802.11 Data field of the Packet Details pane, cannot see any IP or upper later header. The data was not decrypted. Am I missing something?

thank you!