This can happen if the Application Pool in IIS, that DyKnow is installed on, is set to use .NET 4.0. To resolve this issue:
- Open IIS.
- Locate the Application Pool DyKnow is installed on.
- Change it to use the .NET v2.0 framework.
- Restart IIS.
In the example below, DyKnow is installed in the Default Web Site (recommended) and is using theDefaultAppPool.