Component Object Model (COM) Error – CO_E_APPSINGLEUSE 0x800401F6

In this post, you’ll learn about the error “CO_E_APPSINGLEUSE 0x800401F6” that is returned when working with COM based APIs or libraries in Windows.

COM Error Message


What is COM?

Microsoft’s COM stands for Component Object Model. Component Object Model (COM) is a networked, object-oriented framework for building interoperable binary software components.   Microsoft’s OLE (compound documents), ActiveX (Internet-enabled components), and other products are built on the COM base technology.

Error Description

Below is the description of this COM Error.

Application cannot be run more than once