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Error: Code 3820 - You cannot enter that value because it duplicates an existing value in the multi-valued lookup or attachment field. Multi-valued lookup or attachment fields cannot contain duplicate values.


How to fix the Runtime Code 3820 Microsoft Access Error 3820

This article features error number Code 3820, commonly known as Microsoft Access Error 3820 described as You cannot enter that value because it duplicates an existing value in the multi-valued lookup or attachment field. Multi-valued lookup or attachment fields cannot contain duplicate values.


About Runtime Code 3820

Runtime Code 3820 happens when Microsoft Access fails or crashes whilst it's running, hence its name. It doesn't necessarily mean that the code was corrupt in some way, but just that it did not work during its run-time. This kind of error will appear as an annoying notification on your screen unless handled and corrected. Here are symptoms, causes and ways to troubleshoot the problem.


Definitions (Beta)

Here we list some definitions for the words contained in your error, in an attempt to help you understand your problem. This is a work in progress, so sometimes we might define the word incorrectly, so feel free to skip this section!

  • Access - DO NOT USE this tag for Microsoft Access, use [ms-access] instead
  • Attachment - Any additional content added to a digital object, such as an email attachment.
  • Attachment field - Microsoft Office Access 2007 has attachment field type that supports attaching files and graphics to the records in your database.
  • Duplicates - The "duplicates" tag concerns detecting andor dealing with multiple instances of items in collections.
  • Enter - The ENTERRETURN key on the keyboard.
  • Field - In computer science a field is a smaller piece of data from a larger collection.
  • Lookup - Look up is related to indexes and hash tables
  • Access - Microsoft Access, also known as Microsoft Office Access, is a database management system from Microsoft that commonly combines the relational Microsoft JetACE Database Engine with a graphical user interface and software-development tools
  • Microsoft access - Microsoft Access, also known as Microsoft Office Access, is a database management system from Microsoft that commonly combines the relational Microsoft JetACE Database Engine with a graphical user interface and software-development tools

Symptoms of Code 3820 - Microsoft Access Error 3820

Runtime errors happen without warning. The error message can come up the screen anytime Microsoft Access 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.


Fix Microsoft Access Error 3820 (Error Code 3820)
(For illustrative purposes only)



Causes of Microsoft Access Error 3820 - Code 3820

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.

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.
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.
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.
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.
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
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
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 3820 (Microsoft Access-Fehler 3820) - Sie können diesen Wert nicht eingeben, da er einen vorhandenen Wert im mehrwertigen Nachschlage- oder Anhangsfeld dupliziert. Mehrwertige Nachschlage- oder Anhangsfelder dürfen keine doppelten Werte enthalten.
Come fissare Errore 3820 (Errore di Microsoft Access 3820) - Non è possibile immettere tale valore perché duplica un valore esistente nel campo di ricerca o allegato multivalore. I campi di ricerca o allegato multivalore non possono contenere valori duplicati.
Hoe maak je Fout 3820 (Microsoft Access-fout 3820) - U kunt die waarde niet invoeren omdat deze een bestaande waarde dupliceert in het zoek- of bijlageveld met meerdere waarden. Opzoek- of bijlagevelden met meerdere waarden mogen geen dubbele waarden bevatten.
Comment réparer Erreur 3820 (Erreur d'accès Microsoft 3820) - Vous ne pouvez pas saisir cette valeur car elle duplique une valeur existante dans le champ de recherche ou de pièce jointe à plusieurs valeurs. Les champs de recherche ou de pièce jointe à plusieurs valeurs ne peuvent pas contenir de valeurs en double.
어떻게 고치는 지 오류 3820 (마이크로소프트 액세스 오류 3820) - 다중값 조회 또는 첨부 파일 필드의 기존 값을 복제하기 때문에 해당 값을 입력할 수 없습니다. 다중값 조회 또는 첨부 파일 필드는 중복 값을 포함할 수 없습니다.
Como corrigir o Erro 3820 (Erro 3820 do Microsoft Access) - Você não pode inserir esse valor porque ele duplica um valor existente na pesquisa de vários valores ou no campo de anexo. Os campos de pesquisa ou anexo com vários valores não podem conter valores duplicados.
Hur man åtgärdar Fel 3820 (Microsoft Access Error 3820) - Du kan inte ange det värdet eftersom det duplicerar ett befintligt värde i fältet med flera värderingar eller bilagor. Flervärdesuppslagnings- eller bilagefält kan inte innehålla dubblettvärden.
Как исправить Ошибка 3820 (Ошибка Microsoft Access 3820) - Вы не можете ввести это значение, потому что оно дублирует существующее значение в многозначном поле поиска или вложения. Многозначные поля поиска или вложения не могут содержать повторяющиеся значения.
Jak naprawić Błąd 3820 (Błąd Microsoft Access 3820) - Nie możesz wprowadzić tej wartości, ponieważ duplikuje ona istniejącą wartość w wielowartościowym polu odnośnika lub załącznika. Wielowartościowe pola odnośników lub załączników nie mogą zawierać zduplikowanych wartości.
Cómo arreglar Error 3820 (Error 3820 de Microsoft Access) - No puede ingresar ese valor porque duplica un valor existente en el campo de búsqueda o archivo adjunto de varios valores. Los campos de datos adjuntos o de búsqueda de varios valores no pueden contener valores duplicados.




The Author 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.


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