get my authorize.net payment service working

I tried to use [login to view URL] payment service that is setup on my site, and this is what I get when I run the payment. ...An error occurred while trying to report this transaction to the merchant. An e-mail has been sent to the merchant informing them of the error. The following is the result of the attempt to charge your credit card. This transaction has been approved. ......... then I get this email as the merchant ......[login to view URL] Merchant, Your script timed out while we were trying to post transaction results to it. Transaction ID: 4924555758 Transaction Result: This transaction has been approved. The following message was displayed to the customer: ------------------------------An error occurred while trying to report this transaction to the merchant. An e-mail has been sent to the merchant informing them of the error. The following is the result of the attempt to charge your credit card. This transaction has been approved. It is advisable for you to contact the merchant to verify that you will receive the product or service. ................. I have a paypal payment solution as well and it works. just no the authorize.net. I need this working ASAP!