COC-ERR-2015 Failed to Open the Import Wizard Dialog
When the IBM® Cognos® for Microsoft Office Import Content wizard
loads, it pages through the report and populates the tree and creates
a page for each report element. If an unexpected error occurs in the
report, this error is logged.
Try importing the report again. If it fails, open the report in the studio in which is was created and save the report. Check the log file for more detailed information.