I had the same problem with the nexus1000v when I set up tacacs but now I have it as follows:
1.-You must create a .txt or copy the configuration file of your Nexus to a .txt 2.-In the file .txt configures for the tacacs lines a "no" to the configuration
enable ! config terminal ! no tacacs-server key 7 "efdgw" no tacacs-server host 192.168.100.x no aaa group server tacacs+ AAA-LUCAS no aaa authentication login default group AAA-LUCAS no aaa authentication login console group AAA-LUCAS no aaa authorization config-commands default group AAA-LUCAS no aaa accounting default group AAA-LUCAS no aaa authentication login error-enable no tacacs-server directed-request
3.-From a tftp upload the file to the running-config or start-config.
This way I let myself execute command.
I hope and can help you and regards!
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