I'm trying to get a testfor command to find a player holding an item named Key2A. I'm in 1.12 and I'm using the command:

/testfor @p[r=100] {SelectedItemSlot:0b,Inventory:[{Slot:0b,tag:{display:{Name:"key"}}}]}

This outputs:

[00:58:14] shmevan8or did not match the required data structure

Could someone help me?


You don't need SelectedItemSlot when you can just use SelectedItem! Also probably because you were testing for an item named "key", not "Key2A".

/testfor @p[r=100] {SelectedItem:{tag:{display:{Name:"Key2A"}}}}

If you want to test for an item and execute a command at a person you will have to type these commands in a repeating command block:

/scoreboard players reset @a Key2A  
/scoreboard players set {PlayerName} Key2A 1 {SelectedItem:{tag:{display:{Name:"Key2A"}}}}  
/execute @a[score_Key2A_min=1,score_Key2A=1] ~ ~ ~ {Your Commands}  

Before you do this you have to add the objectives:
/scoreboard objectives add Key2A dummy


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