conflict with sandboxie

I tried to run firefox portable sandboxed, but obtained message saying access denied. A similar issue was reported in sandboxie forums by someone else and the answer was to check all config’s in comodo. However I recently installed comodo and the only relevant setting allows firefox portable to connect to internet. How do I fix this?

The default configuration of CIS shouldn’t cause any problems with Sandboxie.

From which application did the message originate? Was it a Sandboxie message, a Windows message, or an alert from CIS?

Can you provide the full text of the message?

It was from Sandboxie.

Sandboxie Start
Couldn’t invoke program:
System Error code:
Access Denied.