thanks for the answer.
ye you're right.
I tried to add below codes into my javascript file
urlUtils.addProxyRule ({ urlPrefix: "https://mymachinename", proxyUrl: "https:proxrserver/proxy.ashx"});
and into proxy.config file
<serverUrl url="https://mymachinename" matchAll="true" />
and i changed to Project URL from VB.NET Project Properties with "https://mymachinename"
doesn't worked. same error.