diff --git a/developer/src/kmc-kmn/src/compiler/compiler.ts b/developer/src/kmc-kmn/src/compiler/compiler.ts
index 8e718116710..df20b698529 100644
--- a/developer/src/kmc-kmn/src/compiler/compiler.ts
+++ b/developer/src/kmc-kmn/src/compiler/compiler.ts
@@ -9,7 +9,7 @@ TODO: implement additional interfaces:
 import { UnicodeSetParser, UnicodeSet, Osk, VisualKeyboard, KvkFileReader } from '@keymanapp/common-types';
 import { CompilerCallbacks, CompilerEvent, CompilerOptions, KeymanFileTypes, KvkFileWriter, KvksFileReader } from '@keymanapp/common-types';
 import loadWasmHost from '../import/kmcmplib/wasm-host.js';
-import { CompilerMessages, mapErrorFromKmcmplib } from './messages.js';
+import { CompilerMessages, mapErrorFromKmcmplib } from './kmn-compiler-messages.js';
 import { WriteCompiledKeyboard } from '../kmw-compiler/kmw-compiler.js';
 
 export interface CompilerResultFile {
diff --git a/developer/src/kmc-kmn/src/compiler/messages.ts b/developer/src/kmc-kmn/src/compiler/kmn-compiler-messages.ts
similarity index 99%
rename from developer/src/kmc-kmn/src/compiler/messages.ts
rename to developer/src/kmc-kmn/src/compiler/kmn-compiler-messages.ts
index cbd35f85155..2995c8f0165 100644
--- a/developer/src/kmc-kmn/src/compiler/messages.ts
+++ b/developer/src/kmc-kmn/src/compiler/kmn-compiler-messages.ts
@@ -42,7 +42,7 @@ export const enum KmnCompilerMessageRanges {
 
 /*
   The messages in this class share the namespace with messages from
-  kmn_compiler_errors.h, which are generated by kmcmplib, so values below 0x1000
+  kmn_compiler_errors.h, which are generated by kmcmplib, so values below 0x900
   are reserved for kmcmplib messages.
 */
 export class CompilerMessages {
diff --git a/developer/src/kmc-kmn/src/kmw-compiler/javascript-strings.ts b/developer/src/kmc-kmn/src/kmw-compiler/javascript-strings.ts
index bea396d4fdb..7c59f69e6f9 100644
--- a/developer/src/kmc-kmn/src/kmw-compiler/javascript-strings.ts
+++ b/developer/src/kmc-kmn/src/kmw-compiler/javascript-strings.ts
@@ -2,7 +2,7 @@ import { TSentinelRecord, GetSuppChar, ExpandSentinel, incxstr, xstrlen, xstrlen
 import { KMX } from "@keymanapp/common-types";
 
 import { callbacks, FCallFunctions, FFix183_LadderLength, FMnemonic, FTabStop, FUnreachableKeys, IsKeyboardVersion10OrLater, IsKeyboardVersion14OrLater, kmxResult, nl, options } from "./compiler-globals.js";
-import { KmwCompilerMessages } from "./messages.js";
+import { KmwCompilerMessages } from "./kmw-compiler-messages.js";
 import { FormatModifierAsBitflags, RuleIsExcludedByPlatform } from "./kmw-compiler.js";
 import { KMXCodeNames, SValidIdentifierCharSet, UnreachableKeyCodes, USEnglishShift, USEnglishUnshift, USEnglishValues } from "./constants.js";
 import { KMWVKeyNames, TKeymanWebTouchStandardKey, VKeyNames } from "./keymanweb-key-codes.js";
diff --git a/developer/src/kmc-kmn/src/kmw-compiler/messages.ts b/developer/src/kmc-kmn/src/kmw-compiler/kmw-compiler-messages.ts
similarity index 91%
rename from developer/src/kmc-kmn/src/kmw-compiler/messages.ts
rename to developer/src/kmc-kmn/src/kmw-compiler/kmw-compiler-messages.ts
index c0d5085dcca..0c2e5bbdb64 100644
--- a/developer/src/kmc-kmn/src/kmw-compiler/messages.ts
+++ b/developer/src/kmc-kmn/src/kmw-compiler/kmw-compiler-messages.ts
@@ -1,4 +1,4 @@
-import { KmnCompilerMessages } from "../compiler/messages.js";
+import { KmnCompilerMessages } from "../compiler/kmn-compiler-messages.js";
 import { CompilerErrorNamespace, CompilerErrorSeverity, CompilerMessageSpec as m } from "@keymanapp/common-types";
 
 const Namespace = CompilerErrorNamespace.KmwCompiler;
@@ -19,7 +19,7 @@ export class KmwCompilerMessages extends KmnCompilerMessages {
 
   static Error_InvalidBegin = () => m(this.ERROR_InvalidBegin,
     `A "begin unicode" statement is required to compile a KeymanWeb keyboard`);
-  static Error_TouchLayoutFileInvalid = (o:{filename:string}) => m(this.ERROR_InvalidTouchLayoutFile,
+  static Error_InvalidTouchLayoutFile = (o:{filename:string}) => m(this.ERROR_InvalidTouchLayoutFile,
     `Touch layout file ${o.filename} is not valid`);
   static Warn_DontMixChiralAndNonChiralModifiers = () => m(this.WARN_DontMixChiralAndNonChiralModifiers,
     `This keyboard contains Ctrl,Alt and LCtrl,LAlt,RCtrl,RAlt sets of modifiers. Use only one or the other set for web target.`);
@@ -55,8 +55,6 @@ export class KmwCompilerMessages extends KmnCompilerMessages {
     `Key "${o.keyId}" on platform "${o.platformName}", layer "${o.layerId}" does not have the key type "Special" or "Special (active)" but has the label "${o.label}". This feature is only supported in Keyman 14 or later`);
   static Error_InvalidKeyCode = (o:{keyId: string}) => m(this.ERROR_InvalidKeyCode,
     `Invalid key identifier "${o.keyId}"`);
-  static Error_InvalidTouchLayoutFile = (o:{msg: string}) => m(this.ERROR_InvalidTouchLayoutFile,
-    `Invalid touch layout file: ${o.msg}`);
   static Warn_TouchLayoutFontShouldBeSameForAllPlatforms = () => m(this.WARN_TouchLayoutFontShouldBeSameForAllPlatforms,
     `The touch layout font should be the same for all platforms.`);
   static Warn_TouchLayoutMissingRequiredKeys = (o:{layerId:string, platformName:string, missingKeys:string}) => m(this.WARN_TouchLayoutMissingRequiredKeys,
@@ -71,4 +69,12 @@ export class KmwCompilerMessages extends KmnCompilerMessages {
   static Error_TouchLayoutIdentifierRequires15 = (o:{keyId:string, platformName:string, layerId:string}) => m(this.ERROR_TouchLayoutIdentifierRequires15,
     `Key "${o.keyId}" on "${o.platformName}", layer "${o.layerId}" has a multi-part identifier which requires version 15.0 or newer.`);
   static ERROR_TouchLayoutIdentifierRequires15 = SevError | 0x0002;
+
+  static Error_InvalidTouchLayoutFileFormat = (o:{msg: string}) => m(this.ERROR_InvalidTouchLayoutFileFormat,
+    `Invalid touch layout file: ${o.msg}`);
+  static ERROR_InvalidTouchLayoutFileFormat = SevError | 0x0003;
+
+  static Error_TouchLayoutFileDoesNotExist = (o:{filename:string}) => m(this.ERROR_TouchLayoutFileDoesNotExist,
+    `Touch layout file ${o.filename} does not exist`);
+  static ERROR_TouchLayoutFileDoesNotExist = SevError | 0x0004;
 };
diff --git a/developer/src/kmc-kmn/src/kmw-compiler/kmw-compiler.ts b/developer/src/kmc-kmn/src/kmw-compiler/kmw-compiler.ts
index 986db18050e..29922a492f2 100644
--- a/developer/src/kmc-kmn/src/kmw-compiler/kmw-compiler.ts
+++ b/developer/src/kmc-kmn/src/kmw-compiler/kmw-compiler.ts
@@ -2,7 +2,7 @@ import { KMX, CompilerOptions, CompilerCallbacks, KvkFileReader, VisualKeyboard,
 import { ExpandSentinel, incxstr, xstrlen } from "./util.js";
 import { options, nl, FTabStop, setupGlobals, IsKeyboardVersion10OrLater, callbacks, FFix183_LadderLength, FCallFunctions, fk } from "./compiler-globals.js";
 import { JavaScript_ContextMatch, JavaScript_KeyAsString, JavaScript_Name, JavaScript_OutputString, JavaScript_Rules, JavaScript_Shift, JavaScript_ShiftAsString, JavaScript_Store, zeroPadHex } from './javascript-strings.js';
-import { KmwCompilerMessages } from "./messages.js";
+import { KmwCompilerMessages } from "./kmw-compiler-messages.js";
 import { ValidateLayoutFile } from "./validate-layout-file.js";
 import { VisualKeyboardFromFile } from "./visual-keyboard-compiler.js";
 import { CompilerResult, STORETYPE_DEBUG, STORETYPE_OPTION, STORETYPE_RESERVED } from "../compiler/compiler.js";
@@ -157,9 +157,12 @@ export function WriteCompiledKeyboard(
     sLayoutFilename = callbacks.resolveFilename(kmnfile, sLayoutFilename);
 
     let result = ValidateLayoutFile(keyboard, options.saveDebug, sLayoutFilename, sVKDictionary, kmxResult.displayMap);
-    if(!result.result) {
+    if(!result) {
       sLayoutFile = '';
-      callbacks.reportMessage(KmwCompilerMessages.Error_TouchLayoutFileInvalid({filename:sLayoutFilename}));
+      return null;
+    } else if(!result.result) {
+      sLayoutFile = '';
+      callbacks.reportMessage(KmwCompilerMessages.Error_InvalidTouchLayoutFile({filename:sLayoutFilename}));
       return null;
     } else {
       sLayoutFile = result.output;
diff --git a/developer/src/kmc-kmn/src/kmw-compiler/validate-layout-file.ts b/developer/src/kmc-kmn/src/kmw-compiler/validate-layout-file.ts
index 6a28c38b477..16bd2dbfddd 100644
--- a/developer/src/kmc-kmn/src/kmw-compiler/validate-layout-file.ts
+++ b/developer/src/kmc-kmn/src/kmw-compiler/validate-layout-file.ts
@@ -3,7 +3,7 @@ import { callbacks, IsKeyboardVersion14OrLater, IsKeyboardVersion15OrLater } fro
 import { JavaScript_Key } from "./javascript-strings.js";
 import { TRequiredKey, CRequiredKeys, CSpecialText10, CSpecialText14, CSpecialText14ZWNJ, CSpecialText14Map } from "./constants.js";
 import { KeymanWebTouchStandardKeyNames, KMWAdditionalKeyNames, VKeyNames } from "./keymanweb-key-codes.js";
-import { KmwCompilerMessages } from "./messages.js";
+import { KmwCompilerMessages } from "./kmw-compiler-messages.js";
 
 
 interface VLFOutput {
@@ -207,13 +207,17 @@ export function ValidateLayoutFile(fk: KMX.KEYBOARD, FDebug: boolean, sLayoutFil
   let reader = new TouchLayoutFileReader();
   let data: TouchLayout.TouchLayoutFile;
   try {
+    if(!callbacks.fs.existsSync(sLayoutFile)) {
+      callbacks.reportMessage(KmwCompilerMessages.Error_TouchLayoutFileDoesNotExist({filename: sLayoutFile}));
+      return null;
+    }
     data = reader.read(callbacks.loadFile(sLayoutFile));
     if(!data) {
       throw new Error('Unknown error reading touch layout file');
     }
   } catch(e) {
-    callbacks.reportMessage(KmwCompilerMessages.Error_InvalidTouchLayoutFile({msg: (e??'Unspecified error').toString()}));
-    return {output:null, result: false};
+    callbacks.reportMessage(KmwCompilerMessages.Error_InvalidTouchLayoutFileFormat({msg: (e??'Unspecified error').toString()}));
+    return null;
   }
 
   let result: boolean = true;
diff --git a/developer/src/kmc-kmn/src/main.ts b/developer/src/kmc-kmn/src/main.ts
index 878e4c87ab7..27a4895da61 100644
--- a/developer/src/kmc-kmn/src/main.ts
+++ b/developer/src/kmc-kmn/src/main.ts
@@ -1,4 +1,4 @@
 
 export { KmnCompiler } from './compiler/compiler.js';
-export { KmnCompilerMessages, CompilerMessages } from './compiler/messages.js';
-export { KmwCompilerMessages } from './kmw-compiler/messages.js';
+export { KmnCompilerMessages, CompilerMessages } from './compiler/kmn-compiler-messages.js';
+export { KmwCompilerMessages } from './kmw-compiler/kmw-compiler-messages.js';
diff --git a/developer/src/kmc-kmn/test/test-messages.ts b/developer/src/kmc-kmn/test/test-messages.ts
index 72066d9018b..8123a78ae7f 100644
--- a/developer/src/kmc-kmn/test/test-messages.ts
+++ b/developer/src/kmc-kmn/test/test-messages.ts
@@ -1,6 +1,6 @@
 import 'mocha';
 import { assert } from 'chai';
-import { CompilerMessages, KmnCompilerMessages } from '../src/compiler/messages.js';
+import { CompilerMessages, KmnCompilerMessages } from '../src/compiler/kmn-compiler-messages.js';
 import { TestCompilerCallbacks, verifyCompilerMessagesObject } from '@keymanapp/developer-test-helpers';
 import { makePathToFixture } from './helpers/index.js';
 import { KmnCompiler } from '../src/main.js';
@@ -51,21 +51,21 @@ describe('CompilerMessages', function () {
     await testForMessage(this, ['invalid-keyboards', 'warn_invalid_vkey_in_kvks_file.kmn'], CompilerMessages.WARN_InvalidVkeyInKvksFile);
   });
 
-  // CERR_DuplicateGroup
+  // ERROR_DuplicateGroup
 
   it('should generate CERR_DuplicateGroup if the kmn contains two groups with the same name', async function() {
     await testForMessage(this, ['invalid-keyboards', 'error_duplicate_group.kmn'], KmnCompilerMessages.ERROR_DuplicateGroup); //TODO: consolidate messages from kmcmplib, CompilerMessages.CERR_DuplicateGroup
     assert.equal(callbacks.messages[0].message, "A group with this name has already been defined. Group 'ខ្មែរ' declared on line 9");
   });
 
-  // CERR_DuplicateStore
+  // ERROR_DuplicateStore
 
   it('should generate CERR_DuplicateStore if the kmn contains two stores with the same name', async function() {
     await testForMessage(this, ['invalid-keyboards', 'error_duplicate_store.kmn'], KmnCompilerMessages.ERROR_DuplicateStore);
     assert.equal(callbacks.messages[0].message, "A store with this name has already been defined. Store 'ខ្មែរ' declared on line 11");
   });
 
-  // CERR_VirtualKeyInContext
+  // ERROR_VirtualKeyInContext
 
   it('should generate ERROR_VirtualKeyInContext if a virtual key is found in the context part of a rule', async function() {
     await testForMessage(this, ['invalid-keyboards', 'error_virtual_key_in_context.kmn'], KmnCompilerMessages.ERROR_VirtualKeyInContext);
diff --git a/developer/src/kmc-kmn/test/test-wasm-uset.ts b/developer/src/kmc-kmn/test/test-wasm-uset.ts
index 0b11ddf789e..e2bf5fcf1d6 100644
--- a/developer/src/kmc-kmn/test/test-wasm-uset.ts
+++ b/developer/src/kmc-kmn/test/test-wasm-uset.ts
@@ -2,7 +2,7 @@ import 'mocha';
 import { assert } from 'chai';
 import { KmnCompiler } from '../src/main.js';
 import { TestCompilerCallbacks } from '@keymanapp/developer-test-helpers';
-import { CompilerMessages } from '../src/compiler/messages.js';
+import { CompilerMessages } from '../src/compiler/kmn-compiler-messages.js';
 import { compilerErrorFormatCode } from '@keymanapp/common-types';
 
 describe('Compiler UnicodeSet function', function() {