Potion effects in certain radius?

I’m currently making a minecraft server for my friends and I to play on, I’m currently having difficultlies with potion effects. I need to effect all players in a 10 block radius. Not all on the game but only the ones in that radius. I thought it was:

/effect @a[r=10] mining_fatiue 2 255

you spelt mining_fatigue like mining_fatiue

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