Parallels Virtualization and Automation Software

SYMPTOMS

If you use protocl version lesser than 1.4.2 in XML API request, the following error occurs:


               <system>
                        <status>error</status>
                        <errcode>1014</errcode>
                        <errtext>Parser error: Request is invalid</errtext>
                </system>
      <output>
............
Element 'complexType': The type has an 'all'
model group in its {content type} and thus cannot be derived from a non-empty
type, since this would produce a 'sequence' model group containing the 'all'
model group; 'all' model groups are not allowed to appear inside other model
groups. in............

RESOLUTION

There are two solutions for this problem. The first, update Plesk 8.3 to patch 2.
And the second, use protocol version 1.4.2 or greater in XML API requests, however in this case make sure that all your API requests are compatible with used protocol version.