Simplified SettingLoadExcpetion by removing the multi-line error handling.

src/main/java/com/nisovin/shopkeepers/config/Config.java

@@ -348,9 +348,6 @@ public abstract class Config {
 	protected <T> void onSettingLoadException(Field field, ConfigurationSection config, SettingLoadException e) throws ConfigLoadException {
 		String configKey = this.getConfigKey(field);
 		Log.warning(this.msgSettingLoadException(configKey, e));
-		for (String extraMessage : e.getExtraMessages()) {
-			Log.warning(this.getLogPrefix() + extraMessage);
-		}
 	}
 
 	protected String msgSettingLoadException(String configKey, SettingLoadException e) {
@@ -419,9 +416,6 @@ public abstract class Config {
 			return (T) valueType.load(defaults, configKey);
 		} catch (SettingLoadException e) {
 			Log.warning(this.msgDefaultSettingLoadException(configKey, e));
-			for (String extraMessage : e.getExtraMessages()) {
-				Log.warning(this.getLogPrefix() + extraMessage);
-			}
 			return null;
 		}
 	}

src/main/java/com/nisovin/shopkeepers/config/value/SettingLoadException.java

@@ -1,33 +1,14 @@
 package com.nisovin.shopkeepers.config.value;
 
-import java.util.Collections;
-import java.util.List;
-
 public class SettingLoadException extends Exception {
 
 	private static final long serialVersionUID = -3068903999888105245L;
 
-	private final List<String> extraMessages;
-
 	public SettingLoadException(String message) {
-		this(message, Collections.emptyList());
-	}
-
-	public SettingLoadException(String message, List<String> extraMessages) {
 		super(message);
-		this.extraMessages = extraMessages;
 	}
 
 	public SettingLoadException(String message, Throwable cause) {
-		this(message, Collections.emptyList(), cause);
-	}
-
-	public SettingLoadException(String message, List<String> extraMessages, Throwable cause) {
 		super(message, cause);
-		this.extraMessages = extraMessages;
-	}
-
-	public List<String> getExtraMessages() {
-		return extraMessages;
 	}
 }

src/main/java/com/nisovin/shopkeepers/config/value/types/ItemDataValue.java

@@ -1,9 +1,5 @@
 package com.nisovin.shopkeepers.config.value.types;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-
 import com.nisovin.shopkeepers.config.value.SettingLoadException;
 import com.nisovin.shopkeepers.config.value.ValueType;
 import com.nisovin.shopkeepers.util.ItemData;
@@ -22,15 +18,13 @@ public class ItemDataValue extends ValueType<ItemData> {
 			// Returns null if the config value is null. Otherwise triggers a warning, which we translate into an
 			// exception.
 			itemData = ItemData.deserialize(configValue, (warning) -> {
-				List<String> extraMessages = Collections.emptyList();
+				String errorMsg = warning;
 				if (warning.contains("Unknown item type")) { // TODO this is ugly
-					extraMessages = Arrays.asList(
-							"All valid material names can be found here: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html"
-					);
+					errorMsg = warning + " (All valid material names can be found here: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html)";
 				}
 				// We can only throw unchecked exceptions here, so we wrap the exception here and unwrap it again
 				// outside:
-				throw new RuntimeException(new SettingLoadException(warning, extraMessages));
+				throw new RuntimeException(new SettingLoadException(errorMsg));
 			});
 		} catch (RuntimeException e) {
 			if (e.getCause() instanceof SettingLoadException) {

src/main/java/com/nisovin/shopkeepers/config/value/types/MaterialValue.java

@@ -1,7 +1,5 @@
 package com.nisovin.shopkeepers.config.value.types;
 
-import java.util.Arrays;
-
 import org.bukkit.Material;
 
 import com.nisovin.shopkeepers.config.value.SettingLoadException;
@@ -23,9 +21,8 @@ public class MaterialValue extends ValueType<Material> {
 		// This assumes that legacy item conversion has already been performed:
 		Material material = Material.matchMaterial(materialName); // Can be null
 		if (material == null) {
-			throw new SettingLoadException("Unknown material: " + materialName, Arrays.asList(
-					"All valid material names can be found here: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html"
-			));
+			throw new SettingLoadException("Unknown material: " + materialName
+					+ " (All valid material names can be found here: https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html)");
 		}
 		return material;
 	}