求助！！运行 UG出现的错误

昆山人

在UG中调用自己做的二次开发功能的时候出现如下的错误（ 在 LOGFILE中截取）

Caught exception while running: Main
System.Security.SecurityException: Request for the permission of type System.Security.Permissions.SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.
   at Change_to_Normal.NXJournal.Main()

The state of the failed permission was:
<IPermission class="System.Security.Permissions.SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
             version="1"
             Flags="UnmanagedCode"/>

Request for the permission of type System.Security.Permissions.SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed.

请问这是什么错误，该怎么解决？