Error using copyfile The requested lookup key was not found in any active activation context

Hi,

I obtained the error as on title for the following commands.

cd subfolder
copyfile('filename.txt', '../')
cd ..

The error also happens if I write as

main_folder = pwd;
cd subfolder
copyfile('filename.txt', main_folder)
cd ..

Please let me know of any possible reasons,

Thanks

[Walter Roberson]

The material I find about that error message suggest it has to do with a corrupted IE7, possibly having been affected by a virus at some earlier point.

[John]

Hi Walter,

I am using IE11 and this is with my computer at workplace, very well-protected from virus. Anything such as Matlab put some restriction based on (but more restricted than) the authority of my computer's account?

[Walter Roberson]

Nearly everything I find says that it is due to broken explorer either after virus fixes or after windows update. http://www.mitchellenright.com/2011/11/01/requested-lookup-key-was-not-found/ talks about issues that can arise if you do a system repair after having upgraded IE versions.

I do find a few other possibilities:

https://pradystechblog.wordpress.com/2010/04/27/error-14007the-requested-lookup-key-was-not-found-in-any-active-activation-context/ Which deals with Windows Installer which I would not expect to be relevant

https://answers.sap.com/questions/3538416/ui-error-the-requested-lookup-key-was-not-found-in.html talks about SAP and connection strings (whatever those are) and says that really it is a Microsoft bug

https://helpdesk.coresystems.ch/hc/en-us/articles/201972041-The-requested-look-up-key-was-not-found-in-any-activation-context-Nachschlageschl%C3%BCssel- is more SAP related that I don't think will help

https://www.veritas.com/support/en_US/article.100016583 sql server not properly registered which seems irrelevant

https://help.extensis.com/hc/en-us/articles/115007239307-Portfolio-Media-Engine-installation-fails-with-Internal-Error-27555-Win- an installer needs a user named Administrator which should also be irrelevant to your situation

As a vague possibility: the bit about missing username during an installation hints to me that just maybe there could be problems if you were copying between systems and the file user credentials do not exist on the destination. I have low confidence in this being the case.

I would suggest that you ask your IT people to do a process trace as you attempt the file copy. But first it would probably be good to reinstall matlab in case some matlab dll got unregistered or corrupted.

[Dave Lee]

I found the reason. I was copying a mexw64 file which was still opened by Matlab. After using command "clear functions", I was able to copy the file. Also I should not move to the subfolder to do copy but should stay in the main folder to do copy. Doing in the main folder will prevent the message above to stop Matlab from running the rest and we can always use status of the command to handle