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[1.16.4] - compileJava FAILED / Build failed with an exception


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I updated my mappings from 1.16.2 to 1.16.4 and I'm not able to run the client.

Any help is welcome, thanks!

error: DoubleBlockTypes is not abstract and does not override abstract method getString() in IStringSerializable
public enum DoubleBlockTypes implements IStringSerializable

Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
1 error

> Task :compileJava FAILED

FAILURE: Build failed with an exception.


import net.minecraft.util.IStringSerializable;

public enum DoubleBlockTypes implements IStringSerializable

    private final String name;

    DoubleBlockTypes(String name)
        this.name = name;

    public String func_176610_l()
        return this.name;


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