importing Project Svr 2003 to 2007 issues

[Justin]

When i run the prescan.exe tool on the Project server 2003 machine i get
the error:

05/07/2007 08:56:08 Error: Cannot get content database Id for SPSite:
http://<URL>/sites/ProjectServer_793
05/07/2007 08:56:08 Microsoft.SharePoint.SPException: There is no Web
named "/sites/ProjectServer_793". --->
System.Runtime.InteropServices.COMException (0x81070504): There is no
Web named "/sites/ProjectServer_793".
at
Microsoft.SharePoint.Library.SPRequestInternalClass.OpenSite(String
bstrUrl, Boolean bGetUrlOnly, String& pbstrServerRelativeUrl, Guid&
pgSiteId, Int32& pOwnerID, Int32& pSecondaryContactID, DateTime&
pdtLastContentChange, DateTime& pdtLastSecurityChange)
at Microsoft.SharePoint.Library.a.a(String A_0, Boolean A_1, String&
A_2, Guid& A_3, Int32& A_4, Int32& A_5, DateTime& A_6, DateTime& A_7)
--- End of inner exception stack trace ---
at Microsoft.SharePoint.Library.a.a(String A_0, Boolean A_1, String&
A_2, Guid& A_3, Int32& A_4, Int32& A_5, DateTime& A_6, DateTime& A_7)
at Microsoft.SharePoint.SPSite.c()
at Microsoft.SharePoint.SPSite.get_ID()
at
Microsoft.SharePoint.PreupgradeReport.Scan.GetContentDBBySite(SPSite
site, SPVirtualServer vs)

From what I can see the projects (14 of them) no longer exist neither
to their SharePoint sites. These are the only errors in the prescan
log, are they safe to ignore?