While i was playing around with /fill, i wanted to try " /fill -818 52 297 -778 53 336 minecraft:repeater " on my flat land world

What I expected to happen was...:
Have the Repeaters fill in the area (Ex. /fill -120 55 -100 -90 55 -150 minecraft:repeater) would've worked

What actually happened was...:
a message in chat saying "There is no such block with name minecraft:repeater"

Steps to Reproduce:
1. You select coordinated you want to fill (Ex. -120 55 -100 and -90 55 -150)
2. Then you type the command /fill X Y Z X2 Y2 Z2 minecraft:repeater