The BUILD DLL command requires that OLE public classes be defined.

• You chose the wrong option from the Build Options dialog box.
  
  Choose another action, such as Build Application.
  
  
• No OLE public classes are defined.
  
  Define one or more OLE public classes. For more information, see the Class Info dialog box or the OLEPUBLIC clause of the DEFINE CLASS command.
  
  

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