Follow these instructions to resolve this error message:

1. Uninstall the Citrix Receiver on the workstation
2. Reinstall the Citrix Receiver on the workstation

If the above steps do not resolve the issue, have your IT Department or Help Desk following the instructions outlined in the following Citrix solution to completely remove Citrix from the workstation so you can uninstall and reinstall successfully:

http://support.citrix.com/article/CTX325140