Mac OS forum

Question

Oi! I need Help to change Screen size in virtualbox!

When i try the codes
VBoxManage setextradata "macOS X" VBoxInternal2/EfiGopMode 5
what Youtubers Provide i get this Error

C:\Program Files\Oracle\VirtualBox>VBoxManage setextradata "macOS X" VBoxInternal2/EfiGopMode 5
VBoxManage.exe: error: Code E_FAIL (0x80004005) - Unspecified error (extended info not available)
VBoxManage.exe: error: Context: "LockMachine(a->session, LockType_Shared)" at line 812 of file VBoxManageMisc.cpp

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Clarification Request
Re: error

In reply to: Oi! I need Help to change Screen size in virtualbox!

So run Mac OS in a virtual box that runs under Windows? And then you get this error in Windows?

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Yes

In reply to: Re: error

Yes! In CMD (with Admin CMD) And i get that error yes...

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Re: error

In reply to: Yes

Looks like it can't lock the virtual machine. Does it happen to be open? Reboot and try again.

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i didnt get the error but didnt work ?

In reply to: Re: error

I tried when the machine was Shutdown, but now i does not show me the error but the code does not seem to work? because the screen size did not change.

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Re: didn't work

In reply to: i didnt get the error but didnt work ?

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