catch error in file chooser

backend/.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "main.go"
+        }
+    ]
+}

backend/server/loading.go

@@ -107,6 +107,10 @@ func (h loadHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 	}
+	if err != nil {
+		httpError(w, err)
+		return
+	}
 	http.Redirect(w, r, h.server.context.config.SubUri+"/load", http.StatusSeeOther)
 }
 

legendsbrowser.code-workspace

@@ -16,5 +16,9 @@
 			"jinliming2.vscode-go-template",
 			"golang.go"
 		]
+	},
+	"launch": {
+		"version": "0.2.0",
+		"configurations": []
 	}
 }