Error message if upload is not possible

arduino-ide-extension/src/browser/contributions/contribution.ts

@@ -222,6 +222,12 @@ export abstract class CoreServiceContribution extends SketchContribution {
       } catch {}
     }
     if (message) {
+      if (message.includes('Missing FQBN (Fully Qualified Board Name)')) {
+        message = nls.localize(
+          'arduino/coreContribution/noBoardSelected',
+          'No board selected. Please select your Arduino board from the Tools > Board menu.'
+        );
+      }
       const copyAction = nls.localize(
         'arduino/coreContribution/copyError',
         'Copy error messages'

arduino-ide-extension/src/browser/contributions/upload-sketch.ts

@@ -61,10 +61,11 @@ export class UploadSketch extends CoreServiceContribution {
     registry.registerCommand(UploadSketch.Commands.UPLOAD_SKETCH, {
       execute: async () => {
         const key = this.selectedFqbnAddress();
-        if (!key) {
-          return;
-        }
-        if (this.boardRequiresUserFields && !this.cachedUserFields.has(key)) {
+        if (
+          this.boardRequiresUserFields &&
+          key &&
+          !this.cachedUserFields.has(key)
+        ) {
           // Deep clone the array of board fields to avoid editing the cached ones
           this.userFieldsDialog.value = (
             await this.boardsServiceProvider.selectedBoardUserFields()

i18n/en.json

@@ -132,7 +132,8 @@
       "replaceTitle": "Replace"
     },
     "coreContribution": {
-      "copyError": "Copy error messages"
+      "copyError": "Copy error messages",
+      "noBoardSelected": "No board selected. Please select your Arduino board from the Tools > Board menu."
     },
     "daemon": {
       "restart": "Restart Daemon",