![c# - How to solve COM Exception Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))? - Stack Overflow c# - How to solve COM Exception Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))? - Stack Overflow](https://i.stack.imgur.com/qmih9.png)
c# - How to solve COM Exception Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))? - Stack Overflow
![Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) · Issue #788 · phw198/OutlookGoogleCalendarSync · GitHub Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) · Issue #788 · phw198/OutlookGoogleCalendarSync · GitHub](https://user-images.githubusercontent.com/3542031/62029033-fbb1c400-b1e1-11e9-98df-f67c813e4fcc.png)
Class not registered (Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG)) · Issue #788 · phw198/OutlookGoogleCalendarSync · GitHub
![OPC-DA COM connection fail, error code: 0x80040154 - General Discussion - Inductive Automation Forum OPC-DA COM connection fail, error code: 0x80040154 - General Discussion - Inductive Automation Forum](https://global.discourse-cdn.com/business4/uploads/inductiveautomation/original/2X/c/c72ce74af8fe3ae1747cc1c78b16ac20d6d1bdf6.jpg)
OPC-DA COM connection fail, error code: 0x80040154 - General Discussion - Inductive Automation Forum
![Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))" error when launching Excel-related functionality, due to MS Office not being installed Exception from HRESULT: 0x80040154 (REGDB_E_CLASSNOTREG))" error when launching Excel-related functionality, due to MS Office not being installed](https://www.ibm.com/support/pages/system/files/inline-images/image_2253.png)