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Adding App-V packages that were sequenced in Microsoft App-V 5.0 SP2 into RES Workspace Manager 2012 SR4 (9.7.4.0) results in the following error messages being displayed:

An Error occured during the execution of a procedure. Contact your administrator or helpdesk with the following info: Prog: pwrtech.exe Procedure: sharedPF8.fysnHasChildNodes Error: (91) Object variable or With block variable not set Machine: <machine name> Program will resume normal operation...

This App-V package contains no shortcuts for RES Workspace Manager to import.

This is a known issue with RES Workspace Manager 2012 SR4. RES is currently working on a fix.

Update 02-01-2014: This bug has been resolved in RES Workspace Manager 2012 SR4 Revision 3 (9.7.4.3), available upon customer request at RES Software. From the release notes:

"Microsoft App-V 5: Packages sequenced with Microsoft App-V 5 SP2 could not be imported in Console
Microsoft App-V 5.0 packages that were sequenced with Microsoft App-V 5 SP2 could not be imported in the RES Workspace Manager Console. This was caused by a change in the layout of Microsoft App-V 5 packages. When importing such packages (at Composition > Applications), the following error was displayed:

"Error (91) Object variable or With block variable not set" 

This has been resolved."

Workaround for those unable upgrade at this time

Packages that benefit from the added features of App-V 5.0 SP2, such as Internet Explorer plug-ins Java and Flash can be published (globally) to the client as they contain no shortcuts and require no interaction with RES Workspace Manager.
However, if you require a shortcut/application that has to be managed by RES Workspace Manager you should sequence the packages in App-V 5.0 SP1 or earlier versions. This means an application such as Adobe Reader which contains both a browser plug-in and an application may require two seperate packages. Alternatively you could to allow the App-V client to manage the shortcuts.