Fix: ERROR_CALL_NOT_IMPLEMENTED 120 (0x78)

Granting required permissions is the quickest fix

4 min. read

Updated onOctober 18, 2024

updated onOctober 18, 2024

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TheERROR_CALL_NOT_IMPLEMENTEDsystem error, with code120 (0x78), appears when running a code, working on an application, or modifying a file/folder, say, deleting a file. The error message reads,This function is not supported on this system.

The error doesn’t appear frequently, but when it does, it’s usually missing permissions, conflicting processes, or a bug in the installed app version to blame.

Before you proceed to the slightly advanced solutions, restart the PC and try performing the same action again. If it’s another process to blame, this should fixERROR_CALL_NOT_IMPLEMENTED.

How do I fix ERROR_CALL_NOT_IMPLEMENTED?

1. Run the affected program as administrator

Sometimes, when you try to delete a file in Visual Studio,ERROR_CALL_NOT_IMPLEMENTEDor its error message appears. This is because the file is loaded in another related process, and terminating it will quickly fix things!

3. Take full ownership of the affected file/folder

If it’s the missing file/folder level permissions to blame forERROR_CALL_NOT_IMPLEMENTED, you will have totake full ownershipand then proceed with the required actions.

4. Disable conflicting third-party software

In several cases, I saw third-party apps, primarily antivirus software, performance-enhancing utilities, or optimization tools, triggering the120 (0x78) This function is not supported on this systemmessage.

So, it’s best that youuninstall appsthat fall into these categories. Don’t remove them all at once. Uninstall one and check for improvements. Only if the error persists should you move to the next!

5. Reinstall another version of the program

When an FTP server withFilezillawas throwing theERROR_CALL_NOT_IMPLEMENTED This function is not supported on this systemerror, downgrading from version1.8.1to version1.8.0resolved things, indicating a bug in the new version!

The same approach can also be applied to other software in a similar situation to fix error code120 (0x78).

Before you leave, discover expert tips tooptimize Windows for performance and securityin order to prevent such errors from reappearing! We also have a guide on anERROR_JOIN_TO_JOIN, so you might want to visit it for more information.

Before you leave, you might be interested in our latest guide onERROR_IS_JOIN_TARGETmessage.

If you know of more fixes for theERROR_CALL_NOT_IMPLEMENTEDerror, share them with our readers in the comments section.

Fix: ERROR_CALL_NOT_IMPLEMENTED 120 (0x78)#

How do I fix ERROR_CALL_NOT_IMPLEMENTED?#

1. Run the affected program as administrator#

2. Terminate all app-related process#

3. Take full ownership of the affected file/folder#

4. Disable conflicting third-party software#

5. Reinstall another version of the program#