Screen Personas 2.0 SP01 is no longer actively maintained. I recommend you to upgrade to the latest SP that was just released SP03 that contains a lot of fixes and performance improvements.
If for some reason you do not want to upgrade and want this to be resolved, check the browser log content when the error occurs and ensure that you have SSO enabled or the webrfc ICF service is configured without a System Logon page.
Regards
Kranthi