there are validation errors on yhis page, click close.....

Hi all,

i am new in SQL server configuration,

i am getting this error when i attempt to configure SQL server 2008 R2, on the server configuration tab,i put a valid account name and password on both service "SQL server agent and SQL server database engine" it displays this error " the are validation errors on this page, click ok to close the dialogue box...."  how can i resolve this error>

thanks