In Eph 2:2 it says, "in which you once walked according to the course of this world...." When I check the interlinear for the word "world" it says it's from the Greek word "kosmos" and the Louw Nida number is "LN 12.44." This is incorrect. LN 12.44 is αἰὼν. It should be LN 41.38 I think. Compare with 1 John 2:15-17.
I found this error in NKJV, but it's also present in ESV, NLT, and others I suppose.
Thanks