diff --git a/src/microsoft-trydotnet-editor/package-lock.json b/src/microsoft-trydotnet-editor/package-lock.json
index 3131a5362..a4c541517 100644
--- a/src/microsoft-trydotnet-editor/package-lock.json
+++ b/src/microsoft-trydotnet-editor/package-lock.json
@@ -9,7 +9,7 @@
       "version": "1.0.0",
       "license": "MIT",
       "dependencies": {
-        "@microsoft/polyglot-notebooks": "1.0.441801",
+        "@microsoft/polyglot-notebooks": "1.0.740304",
         "monaco-editor": "0.56.0",
         "rxjs": "7.8.2",
         "uuid": "14.0.1"
@@ -608,9 +608,9 @@
       }
     },
     "node_modules/@microsoft/polyglot-notebooks": {
-      "version": "1.0.441801",
-      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/npm/registry/@microsoft/polyglot-notebooks/-/polyglot-notebooks-1.0.441801.tgz",
-      "integrity": "sha1-vGUZjaNCd1Wv4b4VL1yH/7FOM5Q=",
+      "version": "1.0.740304",
+      "resolved": "https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-tools/npm/registry/@microsoft/polyglot-notebooks/-/polyglot-notebooks-1.0.740304.tgz",
+      "integrity": "sha1-v9rBexPWAg2xA+0KSxw/Q+1emO8=",
       "license": "MIT",
       "dependencies": {
         "rxjs": "7.5.6",
diff --git a/src/microsoft-trydotnet-editor/package.json b/src/microsoft-trydotnet-editor/package.json
index 289f16aac..9994c7b83 100644
--- a/src/microsoft-trydotnet-editor/package.json
+++ b/src/microsoft-trydotnet-editor/package.json
@@ -53,7 +53,7 @@
     "webpack-cli": "7.0.2"
   },
   "dependencies": {
-    "@microsoft/polyglot-notebooks": "1.0.441801",
+    "@microsoft/polyglot-notebooks": "1.0.740304",
     "monaco-editor": "0.56.0",
     "rxjs": "7.8.2",
     "uuid": "14.0.1"
diff --git a/src/microsoft-trydotnet-editor/src/projectKernel.ts b/src/microsoft-trydotnet-editor/src/projectKernel.ts
index 04efe99cd..c5474beb0 100644
--- a/src/microsoft-trydotnet-editor/src/projectKernel.ts
+++ b/src/microsoft-trydotnet-editor/src/projectKernel.ts
@@ -25,9 +25,14 @@ export abstract class ProjectKernel extends polyglotNotebooks.Kernel {
     this.registerCommandHandler({
       commandType: polyglotNotebooks.SubmitCodeType,
       handle: (commandInvocation: polyglotNotebooks.IKernelCommandInvocation) => {
-
-        this.throwIfProjectIsNotOpened();
-        this.throwIffDocumentIsNotOpened();
+        if (!this._project) {
+          commandInvocation.context.fail(`Project must be opened, send the command '${polyglotNotebooks.OpenProjectType}' first.`);
+          return Promise.resolve();
+        }
+        if (!this._openDocument) {
+          commandInvocation.context.fail(`Document must be opened, send the command '${polyglotNotebooks.OpenDocumentType}' first.`);
+          return Promise.resolve();
+        }
         return this.handleSubmitCode(commandInvocation);
       }
     });
@@ -44,7 +49,10 @@ export abstract class ProjectKernel extends polyglotNotebooks.Kernel {
     this.registerCommandHandler({
       commandType: polyglotNotebooks.OpenDocumentType,
       handle: async (commandInvocation: polyglotNotebooks.IKernelCommandInvocation) => {
-        this.throwIfProjectIsNotOpened();
+        if (!this._project) {
+          commandInvocation.context.fail(`Project must be opened, send the command '${polyglotNotebooks.OpenProjectType}' first.`);
+          return;
+        }
         await this.handleOpenDocument(commandInvocation);
         let command = <polyglotNotebooks.OpenDocument>commandInvocation.commandEnvelope.command;
         this._openDocument = {
@@ -60,8 +68,14 @@ export abstract class ProjectKernel extends polyglotNotebooks.Kernel {
     this.registerCommandHandler({
       commandType: polyglotNotebooks.RequestDiagnosticsType,
       handle: (commandInvocation: polyglotNotebooks.IKernelCommandInvocation) => {
-        this.throwIfProjectIsNotOpened();
-        this.throwIffDocumentIsNotOpened();
+        if (!this._project) {
+          commandInvocation.context.fail(`Project must be opened, send the command '${polyglotNotebooks.OpenProjectType}' first.`);
+          return Promise.resolve();
+        }
+        if (!this._openDocument) {
+          commandInvocation.context.fail(`Document must be opened, send the command '${polyglotNotebooks.OpenDocumentType}' first.`);
+          return Promise.resolve();
+        }
         return this.handleRequestDiagnostics(commandInvocation);
       }
     });
@@ -69,8 +83,14 @@ export abstract class ProjectKernel extends polyglotNotebooks.Kernel {
     this.registerCommandHandler({
       commandType: polyglotNotebooks.RequestCompletionsType,
       handle: (commandInvocation: polyglotNotebooks.IKernelCommandInvocation) => {
-        this.throwIfProjectIsNotOpened();
-        this.throwIffDocumentIsNotOpened();
+        if (!this._project) {
+          commandInvocation.context.fail(`Project must be opened, send the command '${polyglotNotebooks.OpenProjectType}' first.`);
+          return Promise.resolve();
+        }
+        if (!this._openDocument) {
+          commandInvocation.context.fail(`Document must be opened, send the command '${polyglotNotebooks.OpenDocumentType}' first.`);
+          return Promise.resolve();
+        }
         return this.handleRequestCompletions(commandInvocation);
       }
     });
@@ -78,8 +98,14 @@ export abstract class ProjectKernel extends polyglotNotebooks.Kernel {
     this.registerCommandHandler({
       commandType: polyglotNotebooks.RequestHoverTextType,
       handle: (commandInvocation: polyglotNotebooks.IKernelCommandInvocation) => {
-        this.throwIfProjectIsNotOpened();
-        this.throwIffDocumentIsNotOpened();
+        if (!this._project) {
+          commandInvocation.context.fail(`Project must be opened, send the command '${polyglotNotebooks.OpenProjectType}' first.`);
+          return Promise.resolve();
+        }
+        if (!this._openDocument) {
+          commandInvocation.context.fail(`Document must be opened, send the command '${polyglotNotebooks.OpenDocumentType}' first.`);
+          return Promise.resolve();
+        }
         return this.handleRequestHoverText(commandInvocation);
       }
     });
@@ -87,27 +113,19 @@ export abstract class ProjectKernel extends polyglotNotebooks.Kernel {
     this.registerCommandHandler({
       commandType: polyglotNotebooks.RequestSignatureHelpType,
       handle: (commandInvocation: polyglotNotebooks.IKernelCommandInvocation) => {
-        this.throwIfProjectIsNotOpened();
-        this.throwIffDocumentIsNotOpened();
+        if (!this._project) {
+          commandInvocation.context.fail(`Project must be opened, send the command '${polyglotNotebooks.OpenProjectType}' first.`);
+          return Promise.resolve();
+        }
+        if (!this._openDocument) {
+          commandInvocation.context.fail(`Document must be opened, send the command '${polyglotNotebooks.OpenDocumentType}' first.`);
+          return Promise.resolve();
+        }
         return this.handleRequestSignatureHelp(commandInvocation);
       }
     });
   }
 
-  protected throwIfProjectIsNotOpened() {
-    if (!this._project) {
-      // todo : align error message with .NET
-      throw new Error(`Project must be opened, send the command '${polyglotNotebooks.OpenProjectType}' first.`);
-    }
-  }
-
-  protected throwIffDocumentIsNotOpened() {
-    if (!this._openDocument) {
-      // todo : align error message with .NET
-      throw new Error(`Document must be opened, send the command '${polyglotNotebooks.OpenDocumentType}' first.`);
-    }
-  }
-
   protected abstract handleOpenProject(commandInvocation: polyglotNotebooks.IKernelCommandInvocation): Promise<void>;
   protected abstract handleRequestDiagnostics(commandInvocation: polyglotNotebooks.IKernelCommandInvocation): Promise<void>;
   protected abstract handleRequestCompletions(commandInvocation: polyglotNotebooks.IKernelCommandInvocation): Promise<void>;