I think this is simply turned off in the kernel as the error suggests.

grep LATENCY /boot/config*

shows

# CONFIG_LATENCYTOP is not set

I doubt this will be turned on and your best bet is to recompile your
kernel or better perhaps look into newer methods of looking at linux
latency issues, this might be a good start -

http://www.brendangregg.com/blog/2016-10-27/dtrace-for-linux-2016.html

Cheers.

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Title:
  unable to run latencytop

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