Unable to serialize the session state

Question

Hi,

the following error is throwing while uploading an image in the website I am using a sessionState for sqlServer mode in my web.config.If i remove session state its working fine.But when i keep the sessionstate in my web.config
do any one faced this problem before.Please let me know.

ex:
<sessionState allowCustomSqlDatabase="true" cookieless="false" mode="SQLServer" sqlConnectionString="Server=xyz;Database=ASPState;user=abc;password=abc" timeout="90"  />




Thanks,
Prasant