Where did you see the 2060 error code?
when put the project flex another pc and try open by c:\xampp\htdoc\...

What happens if you open the page with a host name different from localhost? (you can configure a fake host name in your system's hosts file)
nothing

Is the crossdomain.xml file configured on your server? (check out the <flex_crossdomain_enabled> element in your server configuration file for details on such file)
i don't use crossdomain.xml. i need?