Timed holograms producing NoSuchMethodError

[rudde0]

Describe the bug

The code below:
display hologram "Hello" at player to player for 20 ticks

Produces,

[12:46:38] [Server thread/WARN]: [Skript] Task #11332 for Skript v2.8.1 generated an exception
java.lang.NoSuchMethodError: 'int ch.njol.skript.util.Timespan.getTicks()'
	at net.rayfall.eyesniper2.skrayfall.holograms.EffTimedClientSideHolo.execute(EffTimedClientSideHolo.java:111) ~[skRayFall+v1.9.28.jar:?]
	at ch.njol.skript.lang.Effect.run(Effect.java:49) ~[Skript-2.8.jar:?]
	at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:61) ~[Skript-2.8.jar:?]
	at ch.njol.skript.lang.TriggerItem.walk(TriggerItem.java:88) ~[Skript-2.8.jar:?]
	at ch.njol.skript.effects.Delay.lambda$walk$0(Delay.java:107) ~[Skript-2.8.jar:?]
	at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftTask.run(CraftTask.java:101) ~[purpur-1.20.4.jar:git-Purpur-2128]
	at org.bukkit.craftbukkit.v1_20_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:480) ~[purpur-1.20.4.jar:git-Purpur-2128]
	at net.minecraft.server.MinecraftServer.tickChildren(MinecraftServer.java:1667) ~[purpur-1.20.4.jar:git-Purpur-2128]
	at net.minecraft.server.dedicated.DedicatedServer.tickChildren(DedicatedServer.java:486) ~[purpur-1.20.4.jar:git-Purpur-2128]
	at net.minecraft.server.MinecraftServer.tickServer(MinecraftServer.java:1546) ~[purpur-1.20.4.jar:git-Purpur-2128]
	at net.minecraft.server.MinecraftServer.runServer(MinecraftServer.java:1235) ~[purpur-1.20.4.jar:git-Purpur-2128]
	at net.minecraft.server.MinecraftServer.lambda$spin$0(MinecraftServer.java:326) ~[purpur-1.20.4.jar:git-Purpur-2128]
	at java.lang.Thread.run(Thread.java:1583) ~[?:?]

Server Information

• Server Version and Type: 1.20.4 Purpur
• Skript Version: 2.8.1
• skRayFall Version: 1.9.28