1.15.2 compiler errors fixed.

Signed-off-by: Pavel Erokhin (MairwunNx) <MairwunNx@gmail.com>

Author: MairwunNx

src/main/kotlin/com/mairwunnx/projectessentials/core/api/v1/commands/back/BackLocationData.kt

@@ -23,7 +23,7 @@ data class BackLocationData(
      * @since 2.0.0-SNAPSHOT.1.
      */
     val position: Position = Position(
-        player.posX, player.posY, player.posZ
+        player.positionVec.x, player.positionVec.y, player.positionVec.z
     ),
     /**
      * Player camera head at the time of teleportation.

src/main/kotlin/com/mairwunnx/projectessentials/core/api/v1/extensions/Extensions.kt

@@ -48,7 +48,7 @@ fun ServerPlayerEntity.playSound(
     val pos = player.positionVec
     DistExecutor.runWhenOn(Dist.CLIENT) {
         Runnable {
-            Minecraft.getInstance().world.playSound(
+            Minecraft.getInstance().world?.playSound(
                 pos.x, pos.y + player.eyeHeight.toDouble(), pos.z,
                 sound, category, volume, pitch, false
             )

src/main/kotlin/com/mairwunnx/projectessentials/core/impl/vanilla/commands/ScheduleCommand.kt

@@ -28,19 +28,16 @@ import net.minecraft.command.impl.FunctionCommand
 import net.minecraft.tags.Tag
 import net.minecraft.util.text.Style
 import net.minecraft.util.text.TranslationTextComponent
-import net.minecraft.util.text.event.HoverEvent
-import org.apache.logging.log4j.LogManager
 import java.util.function.Function
 
 internal object ScheduleCommand : VanillaCommandBase() {
-    private val logger = LogManager.getLogger()
-
     private val field_218913_a =
         SimpleCommandExceptionType(TranslationTextComponent("commands.schedule.same_tick"))
     private val field_229811_b_ = DynamicCommandExceptionType(
         Function { p_229818_0_: Any? ->
             TranslationTextComponent("commands.schedule.cleared.failure", p_229818_0_)
         }
+    )
     private val field_229812_c_ =
         SuggestionProvider { p_229814_0_: CommandContext<CommandSource>, p_229814_1_: SuggestionsBuilder ->
             ISuggestionProvider.suggest(