Added gulp build

Troubleshooting-issues-with-samples.md

@@ -33,10 +33,11 @@ Please note that warnings will rarely prevent the solution from working; We only
 
 ```mermaid
 graph TD
-    A[Run npm install]
+    A([Run npm install])
     A --> B{Errors?}
+    B --> |No|([Try gulp build])
     B --> |Yes| C{Are you in root of project?} --> |No| D[Change directory to root of project] --> |Retry|A
-    B --> |No| E{Running on Windows?} 
+    C --> |Yes| E{Running on Windows?} 
     E --> |Yes| F{Path too long?} --> |Yes| H[Move project to shorter path] --> |Retry|A
     E --> |No| K[Run spfx doctor]
     K --> J{Any reported issues?} --> |Yes| L[Fix issuen] --> |Retry|A