IPV6 Next Hop Security Feature / Neighbor Discovery

HI Team,

I m currently trying to configure IPV6 Next Hop Security Feature /
Neighbor Discovery on my Router.

I have Cisco 2901/11/21 ISR with 15.2.4 M2 Security universal IOS image.

However when i try to configure the IPV6 Next hop security feature,
ISR gives me error.

I have checked the Software Advisor and i can see my IOS is supported.

Can any one assist me or guide what IOS i need or am i missing
something to enable the IPV6 Next HOP security feature.

Any guidance would be a great help.

Rgds,
Joaquim