Error: permission of type 'System.Web.AspNetHostingPermission.....

[Guest]

Hi,
I have created one custom assembly and using the same in my report(.rdl).
i got the following error. I have given full permission but no luck
Error:
Request for the permission of type 'System.Web.AspNetHostingPermission,
System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
failed.

Any help would be appreciated..

Regards
Sri