mount koa-ejs@2 with koa-mount fails about ejs HOT 3 CLOSED

app.use(async (ctx, next) => {
    ctx.render = app.context.render;
    await next();
});

var client1 = koa();  
render(client1, {
  root: path.join(__dirname, "view"),
  viewExt: "html",
  cache: false,
  debug: true
}); 



client1.use(async (ctx, next) => {
    ctx.render = client1.context.render;
    await next();
});

client1.use(async (ctx, next) => {
    await ctx.render(view, locals);
});
 
app.use(mount("/demo", client1)