enalbe the debug stack for IIS server

gistfile1.xml

# modify the CallStack="true", <customErrors mode="Off" /> and <compilation debug="true"> in web.config file.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <configuration>
        ...
        <SharePoint>
            <SafeMode MaxControls="200"
                CallStack="true"
                DirectFileDependencies="10"
                TotalFileDependencies="50"
                AllowPageLevelTrace="false">
                ...
            </SafeMode>
        ...
        </SharePoint>
        <system.web>
            ...
            <customErrors mode="Off" />
            ...
            <compilation debug="true">
            ...
            </compilation>
            ...
        </system.web>
        ...
    </configuration>