Lotus Notes an error was encountered when opening a window

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Lotus Notes an error was encountered when opening a window

Do not reboot your computer ! All you have to do is to terminate the ntaskldr.exe process.

This might happen when hard closing Lotus Notes, for example by terminating the process, or asking Windows to do it when the program does not answer, you might face this issue at the next Lotus Notes start.

Simply go to the Windows Task Manager (by pressing CTRL+ Shift + Esc, or by pressing CTRL + ALT + DEL => Start Task Manager).

There, in the processes tab, find the process called ntaskldr.exe (or nnotesmm.exe or nlnotes.exe), and click on End Process.

Lotus Notes an error was encountered when opening a window : End process ntaskldr.exe
End process ntaskldr.exe

Validate again that you do want to close this process by clicking End Process in the confirmation box.

Lotus Notes an error was encountered when opening a window : Confirm ending of process ntaskldr.exe
Confirm ending of process ntaskldr.exe

You can then open Lotus Notes again from the Windows Start menu or another desktop link / URL ...

Lotus Notes an error was encountered when opening a window : Start Lotus Notes from Windows Start menu
Start Lotus Notes from Windows Start menu

... and you're back in Lotus Notes logon window!

See more details on IBM Error: 'An error was encountered while opening a window' when launching Notes
Lotus Notes an error was encountered when opening a window : Lotus Notes logon interface
Lotus Notes logon interface

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