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.


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.

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

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

Become an Excel Pro: Join Our Course!

Elevate your skills from novice to hero with our Excel 365 Basics course, designed to make you proficient in just a few sessions.

Enroll Here

Elevate your skills from novice to hero with our Excel 365 Basics course, designed to make you proficient in just a few sessions.

... 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 error

When encountering a Lotus Notes error, and an action cannot be done, always start by trying to kill the LotusNotes process, by opening the Windows Task manager.

Then, find the ntaskldr.exe process, right click on it, and select end process.

This will kill the Lotus Notes process, and you can now try to restart the LotusNotes application and see if the error is happening again or not.

Frequently Asked Questions

How can users resolve the common Lotus Notes error that occurs when attempting to open a new window in the application?
This error is often due to issues with the Notes workspace or a corrupt cache.ndk file. Users can try restarting Lotus Notes, clearing the cache by deleting or renaming the cache.ndk file, or rebuilding the workspace to resolve the issue.

Yoann Bierling
About the author - Yoann Bierling
Yoann Bierling is a Web Publishing & Digital Consulting professional, making a global impact through expertise and innovation in technologies. Passionate about empowering individuals and organizations to thrive in the digital age, he is driven to deliver exceptional results and drive growth through educational content creation.

Become an Excel Pro: Join Our Course!

Elevate your skills from novice to hero with our Excel 365 Basics course, designed to make you proficient in just a few sessions.

Enroll Here

Elevate your skills from novice to hero with our Excel 365 Basics course, designed to make you proficient in just a few sessions.



Comments (0)

Leave a comment