Microsoft Dynamics GP Utilities Max Request Length Error

Hi, experts! After the installation of GP2010 R2 is completed, the GP utilities start configuring the system and when it arrives to the last step of SRS Report Deployment Wizard, it shows an error message as shown below.
Please help me on this matter.

Error:
Business Intelligence reports were not deployed
Error Details:
The deployment has exceeded the maximum request length allowed by the target server. Set maxRequestLength="20690" in the web.config file and try deploying again.
Click Retry to deploy the reports again or click Cancel to deploy the reports later.
