CS3:Problem in generating .ps file for an indesign document.

Hello,

I have ported a plug-in built for InDesign server CS2 to CS3.

Generating ".ps" file is one of the functionality of my plug-in.
But for the given document InDesign CS3 server Debug generated the following asserts in the server log.

[21/05/2008 22:21:50] ~InstanceList(): 1 outstanding references to UID 2 (Class kRIDXBoss).
[21/05/2008 22:21:50] ~InstanceList(): 1 outstanding references to UID 216 (Class kAssignmentBoss).
[21/05/2008 22:21:50] ~InstanceList(): 1 outstanding references to UID 5 (Class kContentMgrBoss).
[21/05/2008 22:21:50] ~InstanceList(): 1 outstanding references to UID 187 (Class kAssignmentBoss).
[21/05/2008 22:21:50] ~InstanceList(): 1 outstanding references to UID 218 (Class kAssignedStoryBoss).
[21/05/2008 22:21:50] ~InstanceList(): 1 outstanding references to UID 1 (Class kDocBoss).

I have debugged the code and found that the following API is causing these asserts.
IPrintSetupProvider::StartPrintPub( bool16 & bReturn,
IDocument * iDoc,
UIDRef & styleUIDRef,
IPrintCmdData::PrintUIOptions & printPubUIOpt,
IInkList * iInkList,
ITrapStyleListMgr * iTrapListMgr
)

when i shutdown the InDesign server got crashed.

Can any one of you describe in detail the functionality of this API.

I will be thankful if any one you can give some idea on how to resolve this issue.

Thanks,
sambolus.