To resolve this error message, follow these steps:
1. Log into the Management Reporter client workstation with the network credentials of the user that is receiving the error message.
2. Then, browse to:
C:\Users\<USER's NAME>\AppData\Local\Microsoft_Corporation\ReportViewer.exe_StrongName_qijuo122agqsxvvgll1t2extzwiibvbi\7.0.0.0
3. Rename the user.config file.
4. Start the Report Designer