I don't know what I've done but I've messed up some how and I don't know how to fix it 

package com.igc.sbpm.core.init;

import com.igc.sbpm.SBPM;

import net.minecraft.world.level.block.Block;
import net.minecraft.world.level.block.SoundType;
import net.minecraft.world.level.material.Material;
import net.minecraft.world.level.material.MaterialColor;
import net.minecraftforge.fmllegacy.RegistryObject;
import net.minecraftforge.registries.DeferredRegister;
import net.minecraftforge.registries.ForgeRegistries;

public class BlockInit {
	public static final DeferredRegister<Block> BLOCKS = DeferredRegister.create(ForgeRegistries.BLOCKS,
			SBPM.MOD_ID);

	public static final RegistryObject<Block> SLATE_BLOCK = BLOCKS
			.register("slate_block",
					() -> new Block(AbstractBlock.Properties.create(Material.STONE, MaterialColor.STONE)
							.hardnessAndResistance(1.5f, 0.7f).harvestTool(ToolType.PICKAXE).harvestLevel(2)
							.sound(SoundType.STONE)));
}

it shows a error under AbstractBlock, Properties and Tool Type

forge use since 1.17 mojang class names,
this is why the error occurs, you can use forge bot on discord to convert from mcp to mojang mappings names
command:

!mcp -c moj <class-name> -> retruns the mojang name

 

ah okay thank, do you have any recommendations for any bots and how to use them?

join the forge discord server via link, go to the #bot-commands text channel
typ in the command above and replace "<class-name>" with the class name you want to know
for example:

!mcp -c moj AbstractBlock

the bot returns:

MC 1.16.5: net/minecraft/world/level/block/state/BlockBehaviour
Name: ceg => net/minecraft/world/level/block/state/BlockBehaviour
Side: BOTH
AT: public net.minecraft.block.AbstractBlock

the new name of AbstractBlock is now net.minecraft.world.level.block.state.BlockBehaviour

okay thank you you have helped me so much