example code error - "util/delay.h: No such file or directory"

[gkeepleft]

Hi Im having the following error when trying to upload the example code.

Please help.

ResolveLibrary(util/delay.h)
-> candidates: []
In file included from E:\My Drive! Projects\Gazebo\sk6812_test\sk6812_test.ino:1:0:
C:\Users\Graham\Documents\Arduino\libraries\Arduino_SK6812-master/SK6812.h:4:24: fatal error: util/delay.h: No such file or directory
compilation terminated.
Using library Arduino_SK6812-master in folder: C:\Users\Graham\Documents\Arduino\libraries\Arduino_SK6812-master (legacy)
exit status 1
Error compiling for board ESP32 Dev Module.