The basic nature of this error is that the report that we are trying to open does not have a package assigned / selected and the solution is to the open the report in a report studio and select report package option from the file option. Save it.
I got this error at of the end users machine. Accordingly to my analysis, there are 2 reasons for this error to occur:
1. This report could be pointing to a different package rather than the package from which it was deployed. One more similar issue could be that people could have opened the report and might have cancelled the package loading to check some formatting and may be they saved the report that way before closing.
2. The second issue could be, sometimes (very rarely) we have seen that the package is not created properly by COGNOS itself but in this case when the report does not have a package selected; the error is a little bit different. (Multi processing - framework is been published and some one is trying to create a package at the same time)
Due to lack of time my language is not in its best.
