While attempting to run a Pivotier report to the viewer, this error will be raised if you have not installed the latest Microsoft Report Viewer 2012 version. Sometimes the last part of the Pivotier installation is stopped by Windows User Access Controls. Run the Pivotier.exe as an administrator or download and install the Report Viewer separately. This viewer is installed while running Pivotier.exe on the client PC. Pivotier uses newer Report Viewers than the RTC from Microsoft, so this installation is critical.
You can also download the installation for the report viewer alone at pivotier downloads section at: https://www.microsoft.com/en-us/download/details.aspx?id=35747