diff --git a/packages/orchestratorlib/src/orchestratorhelper.ts b/packages/orchestratorlib/src/orchestratorhelper.ts
index 790a142da..a4ec8a215 100644
--- a/packages/orchestratorlib/src/orchestratorhelper.ts
+++ b/packages/orchestratorlib/src/orchestratorhelper.ts
@@ -17,7 +17,7 @@ import {Utility} from './utility';
 import {Utility as UtilityDispatcher} from '@microsoft/bf-dispatcher';
 
 const ReadText: any = require('read-text-file');
-const LuisBuilder: any = require('@microsoft/bf-lu').V2.LuisBuilder;
+const luisCollateBuildNoValidate: any = require('@microsoft/bf-lu/lib/parser/luis/luisCollate').build;
 const QnaMakerBuilder: any = require('@microsoft/bf-lu').V2.QnAMakerBuilder;
 const processedFiles: string[] = [];
 
@@ -41,23 +41,22 @@ export class OrchestratorHelper {
     fs.mkdirSync(path, {recursive: true});
   }
 
-  public static readBluSnapshotFile(filePath: string): string {
-    return ReadText.readSync(filePath);
-    // ---- NOTE
-    // the code below was trying to normalize unknown labels in a BLU file,
-    // but the unknown labels should have been processed during ingesting
-    // a raw input file (LU, QnA, TSV, etc.) and before creating a BLU file,
-    // so there is really no need to process unknown labels in a BLU file
-    // anymore. The line below is thus deprecated, especially now the BLU
-    // file can be a JSON, so the statement below does not apply anyway.
-    // ---- return Utility.processUnknownSpuriousLabelsInTsvBluFileContent(ReadText.readSync(filePath));
-  }
-
   public static readFile(filePath: string): string {
+    UtilityDispatcher.debuggingLog1(
+      'OrchestratorHElper.readFile() calling ReadText.readSync()',
+      filePath);
     try {
+      const fileStats: fs.Stats = fs.statSync(filePath);
+      if (fileStats.size === 0) {
+        return '';
+      }
       return ReadText.readSync(filePath);
-    } catch {
-      return '';
+    } catch (error) {
+      UtilityDispatcher.debuggingLog2(
+        'EXCEPTION calling ReadText.readSync()',
+        filePath,
+        error);
+      throw error;
     }
   }
 
@@ -124,8 +123,11 @@ export class OrchestratorHelper {
   }
 
   public static getSnapshotFromFile(snapshotPath: string) {
+    UtilityDispatcher.debuggingLog1(
+      'OrchestratorHelper.getSnapshotFromFile()',
+      snapshotPath);
     if (Utility.exists(snapshotPath) && !OrchestratorHelper.isDirectory(snapshotPath)) {
-      return new TextEncoder().encode(OrchestratorHelper.readBluSnapshotFile(snapshotPath));
+      return new TextEncoder().encode(OrchestratorHelper.readFile(snapshotPath));
     }
     return new Uint8Array();
   }
@@ -160,7 +162,6 @@ export class OrchestratorHelper {
           utteranceEntityLabelDuplicateMap);
       }
     }
-    Utility.processUnknownSpuriousLabelsInUtteranceLabelsMap({utteranceLabelsMap, utteranceLabelDuplicateMap});
     return {
       utteranceLabelsMap,
       utteranceLabelDuplicateMap,
@@ -232,7 +233,7 @@ export class OrchestratorHelper {
   }
 
   public static async getEntitiesInLu(luObject: any): Promise<any> {
-    const luisObject: any = await LuisBuilder.fromLUAsync([luObject], OrchestratorHelper.findLuFiles);
+    const luisObject: any = await luisCollateBuildNoValidate([luObject], false, '', OrchestratorHelper.findLuFiles);
     return this.transformEntities(luisObject);
   }
 
@@ -353,7 +354,7 @@ export class OrchestratorHelper {
         default: throw new Error(`Unknown file type ${ext}`);
       }
     } catch (error: any) {
-      throw new Error(`${error.message}${os.EOL}Failed to parse ${filePath}`);
+      throw new Error(`${error.message}${os.EOL}Failed to parse ${filePath}, error=${os.EOL}${UtilityDispatcher.jsonStringify(error)}`);
     }
   }
 
@@ -418,6 +419,12 @@ export class OrchestratorHelper {
     utteranceLabelDuplicateMap: Map<string, Set<string>>,
     utteranceEntityLabelsMap: Map<string, Label[]>,
     utteranceEntityLabelDuplicateMap: Map<string, Label[]>): Promise<void> {
+    UtilityDispatcher.debuggingLog1(
+      'OrchestratorHelper.parseLuContent()',
+      luFile);
+    UtilityDispatcher.debuggingLog1(
+      'OrchestratorHelper.parseLuContent()',
+      luContent);
     if (!luContent || luContent.length === 0) {
       return;
     }
@@ -426,7 +433,7 @@ export class OrchestratorHelper {
         content: luContent,
         id: luFile,
       };
-      const luisObject: any = await LuisBuilder.fromLUAsync([luObject], OrchestratorHelper.findLuFiles);
+      const luisObject: any = await luisCollateBuildNoValidate([luObject], false, '', OrchestratorHelper.findLuFiles);
       if (Utility.toPrintDetailedDebuggingLogToConsole) {
         UtilityDispatcher.debuggingNamedLog1('OrchestratorHelper.parseLuContent(): calling getIntentsEntitiesUtterances()', luisObject, 'luisObject');
       }
diff --git a/packages/orchestratorlib/src/utilitylabelresolver.ts b/packages/orchestratorlib/src/utilitylabelresolver.ts
index 6a846b866..12ddc11e5 100644
--- a/packages/orchestratorlib/src/utilitylabelresolver.ts
+++ b/packages/orchestratorlib/src/utilitylabelresolver.ts
@@ -30,14 +30,14 @@ export class UtilityLabelResolver {
     } = {
       ignore_same_example: ignoreSameExample,
     };
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), ignoreSameExample=${ignoreSameExample}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), resetAll=${resetAll}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), ignoreSameExampleObject=${ignoreSameExampleObject}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), ignoreSameExampleObject.ignore_same_example=${ignoreSameExampleObject.ignore_same_example}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), ignoreSameExample=${ignoreSameExample}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), resetAll=${resetAll}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), ignoreSameExampleObject=${ignoreSameExampleObject}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), ignoreSameExampleObject.ignore_same_example=${ignoreSameExampleObject.ignore_same_example}`);
     const ignoreSameExampleObjectJson: string = Utility.jsonStringify(ignoreSameExampleObject);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), ignoreSameExampleObjectJson=${ignoreSameExampleObjectJson}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), ignoreSameExampleObjectJson=${ignoreSameExampleObjectJson}`);
     LabelResolver.setRuntimeParams(ignoreSameExampleObjectJson, resetAll);
-    Utility.debuggingLog(`read to call Utility.getConfigJson(), LabelResolver.LabelResolver=${LabelResolver.LabelResolver}`);
+    Utility.debuggingLog(`ready to call Utility.getConfigJson(), LabelResolver.LabelResolver=${LabelResolver.LabelResolver}`);
     return LabelResolver.getConfigJson();
   }
 
@@ -49,14 +49,14 @@ export class UtilityLabelResolver {
     } = {
       use_compact_embeddings: !fullEmbeddings,
     };
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), fullEmbeddings=${fullEmbeddings}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), resetAll=${resetAll}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), useCompactEmbeddingsObject=${useCompactEmbeddingsObject}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), useCompactEmbeddingsObject.use_compact_embeddings=${useCompactEmbeddingsObject.use_compact_embeddings}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), fullEmbeddings=${fullEmbeddings}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), resetAll=${resetAll}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), useCompactEmbeddingsObject=${useCompactEmbeddingsObject}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), useCompactEmbeddingsObject.use_compact_embeddings=${useCompactEmbeddingsObject.use_compact_embeddings}`);
     const useCompactEmbeddingsObjectJson: string = Utility.jsonStringify(useCompactEmbeddingsObject);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), useCompactEmbeddingsObjectJson=${useCompactEmbeddingsObjectJson}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), useCompactEmbeddingsObjectJson=${useCompactEmbeddingsObjectJson}`);
     LabelResolver.setRuntimeParams(useCompactEmbeddingsObjectJson, resetAll);
-    Utility.debuggingLog(`read to call Utility.getConfigJson(), LabelResolver.LabelResolver=${LabelResolver.LabelResolver}`);
+    Utility.debuggingLog(`ready to call Utility.getConfigJson(), LabelResolver.LabelResolver=${LabelResolver.LabelResolver}`);
     return LabelResolver.getConfigJson();
   }
 
@@ -68,14 +68,14 @@ export class UtilityLabelResolver {
     } = {
       knn_k: knnK,
     };
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), knnK=${knnK}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), resetAll=${resetAll}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), knnKObject=${knnKObject}`);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), knnKObject.knn_k=${knnKObject.knn_k}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), knnK=${knnK}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), resetAll=${resetAll}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), knnKObject=${knnKObject}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), knnKObject.knn_k=${knnKObject.knn_k}`);
     const knnKObjectJson: string = Utility.jsonStringify(knnKObject);
-    Utility.debuggingLog(`read to call LabelResolver.setRuntimeParams(), knnKObjectJson=${knnKObjectJson}`);
+    Utility.debuggingLog(`ready to call LabelResolver.setRuntimeParams(), knnKObjectJson=${knnKObjectJson}`);
     LabelResolver.setRuntimeParams(knnKObjectJson, resetAll);
-    Utility.debuggingLog(`read to call Utility.getConfigJson(), LabelResolver.LabelResolver=${LabelResolver.LabelResolver}`);
+    Utility.debuggingLog(`ready to call Utility.getConfigJson(), LabelResolver.LabelResolver=${LabelResolver.LabelResolver}`);
     return LabelResolver.getConfigJson();
   }
 
diff --git a/packages/orchestratorlib/test/orchestratorhelper.test.ts b/packages/orchestratorlib/test/orchestratorhelper.test.ts
index 19b03cbf9..23ef63bb4 100644
--- a/packages/orchestratorlib/test/orchestratorhelper.test.ts
+++ b/packages/orchestratorlib/test/orchestratorhelper.test.ts
@@ -425,6 +425,7 @@ describe('Test Suite - orchestratorhelper', () => {
     assert.ok((utteranceEntityLabelsMap.get(utterance) as Label[]).length === 3,
       `(utteranceEntityLabelsMap.get(utterance) as Label[]).length=${(utteranceEntityLabelsMap.get(utterance) as Label[]).length}`);
   });
+
   it('Test.0300 OrchestratorHelper.getJsonIntentEntityScoresUtterances()', function () {
     Utility.resetFlagToPrintDebuggingLogToConsole(UnitTestHelper.getDefaultUnitTestDebuggingLogFlag());
     this.timeout(UnitTestHelper.getDefaultUnitTestTimeout());
@@ -587,6 +588,7 @@ describe('Test Suite - orchestratorhelper', () => {
     assert.ok(result.has('Add item'), 'Incorrect result from getUtteranceLabelsMap, missing Add item utterance');
     assert.ok(result.has('delete to do go shopping'), 'Incorrect result from getUtteranceLabelsMap, missing delete to do go shopping utterance');
   });
+
   it('Test.0600 OrchestratorHelper.parseQnaFile()', async () => {
     const validFile: string = './test/fixtures/parser/valid.qna';
     const inValidFile: string = './test/fixtures/parser/invalid.qna';
@@ -608,7 +610,7 @@ describe('Test Suite - orchestratorhelper', () => {
       utteranceLabelDuplicateMap);
     assert.ok(utteranceLabelsMap.size > 0);
   });
-  it('Test.0600 OrchestratorHelper.parseLuFile()', async () => {
+  it('Test.0601 OrchestratorHelper.parseLuFile()', async () => {
     const validFile: string = './test/fixtures/parser/valid.lu';
     const inValidFile: string = './test/fixtures/parser/invalid.lu';
     const utteranceLabelsMap: Map<string, Set<string>> = new Map<string, Set<string>>();