Try the following steps on affected workstations: 
  1. Ensure that "SAP Crystal Reports runtime engine for .NET framework (32-bit) is installed and listed in Control Panel > Programs > Programs and Features. If missing, the installer can be located in the RE deploy folder in the following path:
  • \\[ServerName]\Deploy\ISSetupPrerequisites\Crystal Reports Support Pack 10
  1. If the error still occurs, uninstall any Crystal Reports software on the computer where the error is occurring, including SAP Crystal Reports runtime engine for .NET Framework. If Crystal Reports XI is installed on this computer, follow these steps to perform a clean uninstall: https://apps.support.sap.com/sap/support/knowledge/public/en/1218535 
Note: We provide links to third-party websites in an effort to help you resolve your issue. We are not responsible for the information on third-party websites, and we cannot assist in implementing the solutions on these websites.
  1. If prompted during the uninstall, reboot the computer.
  2. Re-install the Crystal Reports Support Pack 10 from the file path above
  3. Log into the Raiser's Edge and run a report to confirm that the issue is resolved. 
  4. If the error persists and it was uninstalled in Step 2, re-install Crystal Reports XI.