Macromedia Flex HTTPService error messages

Error Messages
Httpservice Fault: Start tag had no corresponding end tag
Httpservice Fault: An end tag had no corresponding start tag
Httpservice Fault: An XML element was malformed.
If you get any of above error messages while using HTTPService tag in one of your Macromedia Flex applications. Then chances are that XML returned from server-side script or XML file being loaded has invalid structure. Make sure all tags have start and eng tags.