OBIEE 11g Errors: Root XML Node nqw not found in island!

Gosh… I got a strange error today while building one of reports using Answers. The error suddenly appears as “Root XML Node nqw not found in island!” after I modified the report and run it in the dashboard .

The main concern is that the error appearing while I am trying  to edit the request. The error is so annoying that I am neither being able to modify the request and nor being able to run this (actually it is throwing error) .

Reason why it is appearing is , I was just define one presentation variable against the Multiselect Product name and prompted that in the reports criteria filter section . And after running the request it starts throwing this absurd error !! I am not being able to come out from the issue even after logout and clearing the browser session .

This could be resolved by editing the report content using Catalog manager and removing the buggy presentation variable . I have not done much r&d with this report and leave it as it is …. So buggy and frustrating error !!! 😦 I will try to replicate the behavior in a similar but small prototype just to nail down the issue and will update into thread if I find something really useful .