console.readkey报libpng warning: iCCP: known incorrect sRGB profile错误

代码如下：
PingReply pingReply = ping.Send(ListUrl[i], ITimeOut);

                Console.WriteLine("-------------------------------------------");
                Console.WriteLine(string.Format("从{0}回复的IP地址:{1}", ListUrl[i], pingReply.Address));
                Console.WriteLine(string.Format("ping耗时:{0}毫秒", pingReply.RoundtripTime));
                Console.WriteLine(string.Format("ping结果:{0}", pingReply.Status));
                Console.ReadKey();

报错：
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: cHRM chunk does not match sRGB
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile
libpng warning: iCCP: known incorrect sRGB profile

                                    是什么原因

这是什么时候报的错啊，
编译，运行：readKey(),是你一按下就报错，还是什么时候的啊？
而且，看字面是和RGB 图片相关的，是其他地方报的错吧/