How to fix the Runtime Code 406 Non-modal forms cannot be displayed in this host application from an ActiveX DLL

Symptoms of Code 406 - Non-modal forms cannot be displayed in this host application from an ActiveX DLL

Runtime errors happen without warning. The error message can come up the screen anytime Windows is run. In fact, the error message or some other dialogue box can come up again and again if not addressed early on.

There may be instances of files deletion or new files appearing. Though this symptom is largely due to virus infection, it can be attributed as a symptom for runtime error, as virus infection is one of the causes for runtime error. User may also experience a sudden drop in internet connection speed, yet again, this is not always the case.

(For illustrative purposes only)

Causes of Non-modal forms cannot be displayed in this host application from an ActiveX DLL - Code 406

During software design, programmers code anticipating the occurrence of errors. However, there are no perfect designs, as errors can be expected even with the best program design. Glitches can happen during runtime if a certain error is not experienced and addressed during design and testing.

Runtime errors are generally caused by incompatible programs running at the same time. It may also occur because of memory problem, a bad graphics driver or virus infection. Whatever the case may be, the problem must be resolved immediately to avoid further problems. Here are ways to remedy the error.

Repair Methods

Runtime errors may be annoying and persistent, but it is not totally hopeless, repairs are available. Here are ways to do it.

If a repair method works for you, please click the upvote button to the left of the answer, this will let other users know which repair method is currently working the best.

Please note: Neither ErrorVault.com nor it's writers claim responsibility for the results of the actions taken from employing any of the repair methods listed on this page - you complete these steps at your own risk.

Method 1 - Close Conflicting Programs

up vote 0 down vote

When you get a runtime error, keep in mind that it is happening due to programs that are conflicting with each other. The first thing you can do to resolve the problem is to stop these conflicting programs.

• Open Task Manager by clicking Ctrl-Alt-Del at the same time. This will let you see the list of programs currently running.
• Go to the Processes tab and stop the programs one by one by highlighting each program and clicking the End Process buttom.
• You will need to observe if the error message will reoccur each time you stop a process.
• Once you get to identify which program is causing the error, you may go ahead with the next troubleshooting step, reinstalling the application.

Method 2 - Update / Reinstall Conflicting Programs

up vote 0 down vote

Using Control Panel

• For Windows 7, click the Start Button, then click Control panel, then Uninstall a program
• For Windows 8, click the Start Button, then scroll down and click More Settings, then click Control panel > Uninstall a program.
• For Windows 10, just type Control Panel on the search box and click the result, then click Uninstall a program
• Once inside Programs and Features, click the problem program and click Update or Uninstall.
• If you chose to update, then you will just need to follow the prompt to complete the process, however if you chose to Uninstall, you will follow the prompt to uninstall and then re-download or use the application's installation disk to reinstall the program.

Using Other Methods

• For Windows 7, you may find the list of all installed programs when you click Start and scroll your mouse over the list that appear on the tab. You may see on that list utility for uninstalling the program. You may go ahead and uninstall using utilities available in this tab.
• For Windows 10, you may click Start, then Settings, then choose Apps.
• Scroll down to see the list of Apps and features installed in your computer.
• Click the Program which is causing the runtime error, then you may choose to uninstall or click Advanced options to reset the application.

Method 3 - Update your Virus protection program or download and install the latest Windows Update

up vote 0 down vote

Virus infection causing runtime error on your computer must immediately be prevented, quarantined or deleted. Make sure you update your virus program and run a thorough scan of the computer or, run Windows update so you can get the latest virus definition and fix.

Method 4 - Re-install Runtime Libraries

up vote 0 down vote

You might be getting the error because of an update, like the MS Visual C++ package which might not be installed properly or completely. What you can do then is to uninstall the current package and install a fresh copy.

• Uninstall the package by going to Programs and Features, find and highlight the Microsoft Visual C++ Redistributable Package.
• Click Uninstall on top of the list, and when it is done, reboot your computer.
• Download the latest redistributable package from Microsoft then install it.

Method 5 - Run Disk Cleanup

up vote 0 down vote

You might also be experiencing runtime error because of a very low free space on your computer.

• You should consider backing up your files and freeing up space on your hard drive
• You can also clear your cache and reboot your computer
• You can also run Disk Cleanup, open your explorer window and right click your main directory (this is usually C: )
• Click Properties and then click Disk Cleanup

Method 6 - Reinstall Your Graphics Driver

up vote 0 down vote

If the error is related to a bad graphics driver, then you may do the following:

• Open your Device Manager, locate the graphics driver
• Right click the video card driver then click uninstall, then restart your computer

Method 7 - IE related Runtime Error

up vote 0 down vote

If the error you are getting is related to the Internet Explorer, you may do the following:

1. Reset your browser.
• For Windows 7, you may click Start, go to Control Panel, then click Internet Options on the left side. Then you can click Advanced tab then click the Reset button.
• For Windows 8 and 10, you may click search and type Internet Options, then go to Advanced tab and click Reset.
2. Disable script debugging and error notifications.
• On the same Internet Options window, you may go to Advanced tab and look for Disable script debugging
• Put a check mark on the radio button
• At the same time, uncheck the "Display a Notification about every Script Error" item and then click Apply and OK, then reboot your computer.

If these quick fixes do not work, you can always backup files and run repair reinstall on your computer. However, you can do that later when the solutions listed here did not do the job.

Other languages:

Wie beheben Fehler 406 (Nicht-modale Formulare können in dieser Hostanwendung nicht von einer ActiveX-DLL angezeigt werden) - Nicht-modale Formulare können von den meisten Hostanwendungen nicht angezeigt werden.
Come fissare Errore 406 (I moduli non modali non possono essere visualizzati in questa applicazione host da una DLL ActiveX) - I moduli non modali non possono essere visualizzati dalla maggior parte delle applicazioni host.
Hoe maak je Fout 406 (Niet-modale formulieren kunnen niet worden weergegeven in deze hosttoepassing vanuit een ActiveX DLL) - Niet-modale formulieren kunnen niet worden weergegeven vanuit de meeste hosttoepassingen.
Comment réparer Erreur 406 (Les formulaires non modaux ne peuvent pas être affichés dans cette application hôte à partir d'une DLL ActiveX) - Les formulaires non modaux ne peuvent pas être affichés à partir de la plupart des applications hôtes.
어떻게 고치는 지 오류 406 (비모달 형식은 ActiveX DLL에서 이 호스트 응용 프로그램에 표시할 수 없습니다.) - 비모달 형식은 대부분의 호스트 응용 프로그램에서 표시할 수 없습니다.
Como corrigir o Erro 406 (Formulários não modais não podem ser exibidos neste aplicativo host a partir de uma DLL ActiveX) - Os formulários não modais não podem ser exibidos na maioria dos aplicativos host.
Hur man åtgärdar Fel 406 (Icke-modala formulär kan inte visas i denna värdapplikation från en ActiveX DLL) - Icke-modala formulär kan inte visas från de flesta värdprogram.
Как исправить Ошибка 406 (Немодальные формы не могут отображаться в этом главном приложении из ActiveX DLL.) - Немодальные формы не могут отображаться из большинства хост-приложений.
Jak naprawić Błąd 406 (Formularzy niemodalnych nie można wyświetlić w tej aplikacji hosta z biblioteki DLL ActiveX) - Formularzy niemodalnych nie można wyświetlić z większości aplikacji hosta.
Cómo arreglar Error 406 (Los formularios no modales no se pueden mostrar en esta aplicación de host desde una DLL de ActiveX) - Los formularios no modales no se pueden mostrar desde la mayoría de las aplicaciones de host.

About The Author: Phil Hart has been a Microsoft Community Contributor since 2010. With a current point score over 100,000, they've contributed more than 3000 answers in the Microsoft Support forums and have created almost 200 new help articles in the Technet Wiki.

Follow Us: