This error can occur if the temporary folder specified in the Camtasia Studio Recorder does not exist, of if your account does not have read and write access to the folder.
To check to see which folder is being used as the temp folder, open the Camtasia Studio Recorder and click Tools > Options. On the General tab, you will see a Temporary folder section. Ensure within Windows that the folder exists and that your account has read/write access.
If you need to switch folders, click the Browse button and select a folder that does have the appropriate permissions.