Receiving a strong name error when trying to access a library

[pottschmidtr]

I receive the following error 'Request for the permission of type
System.Security.Permissions.StrongNameIdentityPerm ission, mscorlib,
Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
failed.' when I try to access a property or method of the library. I
was wondering if the library is secure with a key, so the caller has to
be sign with same key or I'm calling the library incorrectly. Do I need
an assembly tag with in code?

I'm attempting to add functionality to a product by adding inline C#
code to a ASP.Net control. The software does not have a published SDK
but I can determine how to use the libaries from previous versions. Any
help is greatly appreciated and links to documentation or explanation
are great helps for learning.

Thank you for the time,

Robert Pottschmidt

Below is the code sample:
....
Software.DataLayer.One a;
Software.BusinessLogic.Two b;
a =(Software.Libary.One) Session["XXXXX"];
a = l.Inbox; //The code blows up here with the above error
....
PermView of the classes:

C:\Documents and Settings\rob>permview /decl Software.Libary.dll

Microsoft (R) .NET Framework Permission Request Viewer. Version
1.1.4322.573
Copyright (C) Microsoft Corporation 1998-2002. All rights reserved.

Class Software.DataLayer.One LinktimeDemand permission set:
<PermissionSet class="System.Security.PermissionSet"
version="1">
<IPermission
class="System.Security.Permissions.StrongNameIdent ityPermission,
mscorlib, Version=1.0.5000.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089"
version="1"

PublicKeyBlob="00240000048000009400000006020000002 40000525341310
0040000010001007F850AB9C51768C40BB2BC90AC0E7A733B0 717D1139F2BDE487A76A8FA93E887D
2CB0B63EF25B401038A7A48CA5DB638EFD867515D8219EF8A5 8F3B1D098C89C278F6078789564F1F
6F6C088729F4D0D3BEE66E923A49B9A22E3404837A14E5DDB1 AC258BB0C122329B06E531E05CF2E7
214936E57EE0F998BC093AD2C351BB9"/>
</PermissionSet>