This error generally happens when rdpclip has become unstable. To solve this issue you can simply restart the rdpclip.exe application.
To do this open task manager, click on "Details" then find rdpclip.exe
Now end task on rdpclip.exe
Next you can restart the rdpclip.exe by running a new task
Enter rdpclip and click "OK"
That's it, your done and the problem should be solved.