Okay, try to manual make your Render class:

https://github.com/Cadiboo/Example-Mod/blob/1.15.2/src/main/java/io/github/cadiboo/examplemod/client/render/entity/WildBoarRenderer.java

And you don‘t really need the Enderslime model, as it was the same as the Slime model: delete this class and extends in your EnderslimeRenderer class MobRenderer. First parameter was the Entity (not Entitytype) and the second parameter was the Slimemodel. If you need to add a parameter to the Slimemodel then try to add the same Entity class. In others words, see Cadiboo Github link above (don‘t add a layer, slimes don‘t have layers).

9 minutes ago, diesieben07 said:

Your repository is missing the build.gradle. Please add it so I can test this locally.

Pushed.

14 minutes ago, DragonITA said:

Okay, try to manual make your Render class:

https://github.com/Cadiboo/Example-Mod/blob/1.15.2/src/main/java/io/github/cadiboo/examplemod/client/render/entity/WildBoarRenderer.java

And you don‘t really need the Enderslime model, as it was the same as the Slime model: delete this class and extends in your EnderslimeRenderer class MobRenderer. First parameter was the Entity (not Entitytype) and the second parameter was the Slimemodel. If you need to add a parameter to the Slimemodel then try to add the same Entity class. In others words, see Cadiboo Github link above (don‘t add a layer, slimes don‘t have layers).

Nope, it didn't help.

How it was possibly to use a outdated version of Forge?

How to delete my reply?

Edited February 27, 20205 yr by DragonITA

4 minutes ago, DragonITA said:

How it was possibly to use a outdated version of Forge?

outdated version? it is 1.15.2 latest, nope?

7 minutes ago, diesieben07 said:

You are using an outdated version of Forge, which has a bug on the newest version of Java 8.

I am not going to downgrade my Java just so I can run your code using an outdated version, sorry.

 

Just now, Emily_Ravenhold said:

outdated version? it is 1.15.2 latest, nope?

 

 

1 minute ago, diesieben07 said:

You are using 1.15, not even the latest Minecraft version, let alone Forge version.

what should i do to fix it? i can update forge/minecraft/downgrade java version

What Version of Java are you using?

What Version of Minecraft are you using?

What Version of Forge are you using?

Edited February 27, 20205 yr by DragonITA

java version "1.8.0_231"
Java(TM) SE Runtime Environment (build 1.8.0_231-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)

1 minute ago, DragonITA said:

What Version of Java are you using?

 

3 minutes ago, DragonITA said:

What Version of Minecraft are you using?

What Version of Forge are you using?

 

Edited February 27, 20205 yr by DragonITA

2 minutes ago, diesieben07 said:

Can you please stop blocking this thread with useless questions? Thank you.

Sorry, how can i delete Replys?

Edited February 27, 20205 yr by DragonITA

1 minute ago, diesieben07 said:

Can you please stop blocking this thread with useless questions? Thank you.

 

Update Forge.

1.15.2 do you mean?

Yes, if you can the recommended Version.

Edited February 27, 20205 yr by DragonITA

It works! Thanks!