update code for go version 1.24

_examples/file-server/single-page-application/embedded-single-page-application/main.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+
 	"github.com/kataras/iris/v12"
 )
 
@@ -27,7 +29,7 @@ func newApp() *iris.Application {
 	app.Get("/", func(ctx iris.Context) {
 		ctx.ViewData("Page", page)
 		if err := ctx.View("index.html"); err != nil {
-			ctx.HTML("<h3>%s</h3>", err.Error())
+			ctx.HTML(fmt.Sprintf("<h3>%s</h3>", err.Error()))
 			return
 		}
 	})