When try to view report, ReportServer directory showed out instead of running the report.

When I click on report icon in Page Contents, or click on View tab in report, why the page redirect to ReportServer directory rather than run the report

Then from the ReportServer directory, I click on RSReportServer.config then it will list out all the Reports available in the report server. If I click on the report name, the report start running, but never success or report never come out... just indicating "Report is being generated"

How to resolve this problem