Error in Avast! Engine: Invalid Arguments

Hi! I have Ubuntu 9.10 32-Bit as my Operating System. I am curious about Avast! issue. An error message is telling me this: “Error occurred in Avast! Engine: Invalid Arguments. ” My Avast! is newly installed and I haven’t used it yet because I am encountering this error. I’m wondering whether I did something wrong in the installation process. I am hoping to get some informative responses from here.
Thank you very much.
