diff --git a/src/vs/workbench/services/configuration/common/configurationEditing.ts b/src/vs/workbench/services/configuration/common/configurationEditing.ts
index 96e9fb440daef34bdbc580d169be5b2ae9c6ebbc..5cd14ca32295643014d3c1f0cd3ae971a4458cc3 100644
--- a/src/vs/workbench/services/configuration/common/configurationEditing.ts
+++ b/src/vs/workbench/services/configuration/common/configurationEditing.ts
@@ -18,14 +18,19 @@ export enum ConfigurationEditingErrorCode {
 	ERROR_UNKNOWN_KEY,
 
 	/**
-	 * Error when trying to write a configuration key that is not supported for provided target.
+	 * Error when trying to write an invalid folder configuration key to folder settings.
 	 */
-	ERROR_INVALID_KEY,
+	ERROR_INVALID_FOLDER_CONFIGURATION,
 
 	/**
 	 * Error when trying to write to user target but not supported for provided key.
 	 */
-	ERROR_INVALID_TARGET,
+	ERROR_INVALID_USER_TARGET,
+
+	/**
+	 * Error when trying to write a configuration key to folder target
+	 */
+	ERROR_INVALID_FOLDER_TARGET,
 
 	/**
 	 * Error when trying to write to the workspace configuration without having a workspace opened.
diff --git a/src/vs/workbench/services/configuration/node/configurationEditingService.ts b/src/vs/workbench/services/configuration/node/configurationEditingService.ts
index 4a01ed7b6475aeb69e1bde96edfd7713f2b04927..259864baf1c5f95a200e386eb7390c21e1bea772 100644
--- a/src/vs/workbench/services/configuration/node/configurationEditingService.ts
+++ b/src/vs/workbench/services/configuration/node/configurationEditingService.ts
@@ -153,22 +153,23 @@ export class ConfigurationEditingService implements IConfigurationEditingService
 		this.commandService.executeCommand(ConfigurationTarget.USER === target ? 'workbench.action.openGlobalSettings' : 'workbench.action.openWorkspaceSettings');
 	}
 
-	private wrapError(code: ConfigurationEditingErrorCode, target: ConfigurationTarget): TPromise<never> {
-		const message = this.toErrorMessage(code, target);
+	private wrapError(code: ConfigurationEditingErrorCode, target: ConfigurationTarget, operation: IConfigurationEditOperation): TPromise<never> {
+		const message = this.toErrorMessage(code, target, operation);
 
 		return TPromise.wrapError<never>(new ConfigurationEditingError(message, code));
 	}
 
-	private toErrorMessage(error: ConfigurationEditingErrorCode, target: ConfigurationTarget): string {
+	private toErrorMessage(error: ConfigurationEditingErrorCode, target: ConfigurationTarget, operation: IConfigurationEditOperation): string {
 		switch (error) {
 
 			// API constraints
-			case ConfigurationEditingErrorCode.ERROR_UNKNOWN_KEY: return nls.localize('errorUnknownKey', "Unable to write to the configuration file (Unknown Key)");
-			case ConfigurationEditingErrorCode.ERROR_INVALID_KEY: return nls.localize('errorInvalidKey', "Unable to write to the configuration file (Invalid Key)");
-			case ConfigurationEditingErrorCode.ERROR_INVALID_TARGET: return nls.localize('errorInvalidTarget', "Unable to write to the configuration file (Invalid Target)");
+			case ConfigurationEditingErrorCode.ERROR_UNKNOWN_KEY: return nls.localize('errorUnknownKey', "Unable to write to {0} because {1} is not a registered configuration.", this.stringifyTarget(target), operation.key);
+			case ConfigurationEditingErrorCode.ERROR_INVALID_FOLDER_CONFIGURATION: return nls.localize('errorInvalidFolderConfiguration', "Unable to write to Folder Settings because {0} does not support the folder resource scope.", operation.key);
+			case ConfigurationEditingErrorCode.ERROR_INVALID_USER_TARGET: return nls.localize('errorInvalidUserTarget', "Unable to write to User Settings because {0} does not support for global scope.", operation.key);
+			case ConfigurationEditingErrorCode.ERROR_INVALID_FOLDER_TARGET: return nls.localize('errorInvalidFolderTarget', "Unable to write to Folder Settings because no resource is provided.");
+			case ConfigurationEditingErrorCode.ERROR_NO_WORKSPACE_OPENED: return nls.localize('errorNoWorkspaceOpened', "Unable to write to {0} because no workspace is opened. Please open a workspace first and try again.", this.stringifyTarget(target));
 
 			// User issues
-			case ConfigurationEditingErrorCode.ERROR_NO_WORKSPACE_OPENED: return nls.localize('errorNoWorkspaceOpened', "Unable to write into settings because no workspace is opened. Please open a workspace first and try again.");
 			case ConfigurationEditingErrorCode.ERROR_INVALID_CONFIGURATION: {
 				if (target === ConfigurationTarget.USER) {
 					return nls.localize('errorInvalidConfiguration', "Unable to write into settings. Please open **User Settings** to correct errors/warnings in the file and try again.");
@@ -186,6 +187,17 @@ export class ConfigurationEditingService implements IConfigurationEditingService
 		}
 	}
 
+	private stringifyTarget(target: ConfigurationTarget): string {
+		switch (target) {
+			case ConfigurationTarget.USER:
+				return nls.localize('userTarget', "User Settings");
+			case ConfigurationTarget.WORKSPACE:
+				return nls.localize('workspaceTarget', "Workspace Settings");
+			case ConfigurationTarget.FOLDER:
+				return nls.localize('folderTarget', "Folder Settings");
+		}
+	}
+
 	private getEdits(model: editorCommon.IModel, edit: IConfigurationEditOperation): Edit[] {
 		const { tabSize, insertSpaces } = model.getOptions();
 		const eol = model.getEOL();
@@ -229,28 +241,28 @@ export class ConfigurationEditingService implements IConfigurationEditingService
 		if (!operation.isWorkspaceStandalone) {
 			const validKeys = this.configurationService.keys().default;
 			if (validKeys.indexOf(operation.key) < 0 && !OVERRIDE_PROPERTY_PATTERN.test(operation.key)) {
-				return this.wrapError(ConfigurationEditingErrorCode.ERROR_UNKNOWN_KEY, target);
+				return this.wrapError(ConfigurationEditingErrorCode.ERROR_UNKNOWN_KEY, target, operation);
 			}
 		}
 
 		// Target cannot be user if is standalone
 		if (operation.isWorkspaceStandalone && target === ConfigurationTarget.USER) {
-			return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_TARGET, target);
+			return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_USER_TARGET, target, operation);
 		}
 
 		// Target cannot be workspace or folder if no workspace opened
 		if ((target === ConfigurationTarget.WORKSPACE || target === ConfigurationTarget.FOLDER) && !this.contextService.hasWorkspace()) {
-			return this.wrapError(ConfigurationEditingErrorCode.ERROR_NO_WORKSPACE_OPENED, target);
+			return this.wrapError(ConfigurationEditingErrorCode.ERROR_NO_WORKSPACE_OPENED, target, operation);
 		}
 
 		if (target === ConfigurationTarget.FOLDER) {
 			if (!operation.resource) {
-				return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_TARGET, target);
+				return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_FOLDER_TARGET, target, operation);
 			}
 
 			const configurationProperties = Registry.as<IConfigurationRegistry>(ConfigurationExtensions.Configuration).getConfigurationProperties();
 			if (configurationProperties[operation.key].scope !== ConfigurationScope.RESOURCE) {
-				return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_KEY, target);
+				return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_FOLDER_CONFIGURATION, target, operation);
 			}
 		}
 
@@ -259,12 +271,12 @@ export class ConfigurationEditingService implements IConfigurationEditingService
 				const model = reference.object.textEditorModel;
 
 				if (this.hasParseErrors(model, operation)) {
-					return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_CONFIGURATION, target);
+					return this.wrapError(ConfigurationEditingErrorCode.ERROR_INVALID_CONFIGURATION, target, operation);
 				}
 
 				// Target cannot be dirty if not writing into buffer
 				if (checkDirty && this.textFileService.isDirty(operation.resource)) {
-					return this.wrapError(ConfigurationEditingErrorCode.ERROR_CONFIGURATION_FILE_DIRTY, target);
+					return this.wrapError(ConfigurationEditingErrorCode.ERROR_CONFIGURATION_FILE_DIRTY, target, operation);
 				}
 				return TPromise.wrap(reference);
 			});
diff --git a/src/vs/workbench/services/configuration/test/node/configurationEditingService.test.ts b/src/vs/workbench/services/configuration/test/node/configurationEditingService.test.ts
index b2b7246fe27fcdf8b62e91f53aa7fb4b630897af..7224039236d59c532a18ea96cba4012040ee4fc3 100644
--- a/src/vs/workbench/services/configuration/test/node/configurationEditingService.test.ts
+++ b/src/vs/workbench/services/configuration/test/node/configurationEditingService.test.ts
@@ -178,7 +178,7 @@ suite('ConfigurationEditingService', () => {
 	test('errors cases - invalid target', () => {
 		return testObject.writeConfiguration(ConfigurationTarget.USER, { key: 'tasks.something', value: 'value' })
 			.then(() => assert.fail('Should fail with ERROR_INVALID_TARGET'),
-			(error: ConfigurationEditingError) => assert.equal(error.code, ConfigurationEditingErrorCode.ERROR_INVALID_TARGET));
+			(error: ConfigurationEditingError) => assert.equal(error.code, ConfigurationEditingErrorCode.ERROR_INVALID_USER_TARGET));
 	});
 
 	test('errors cases - no workspace', () => {