Unable to execute the packed EXE

[B-codes-core]

As a test, I tried to run gopacker on calc.exe. When i try to run the packed calc.exe, I am getting the below error. Can anyone help me with why this error is ocurring?

At first the below error ocurrs 2025/04/02 22:42:24 failed expanding self path: exec: "calc-out.exe": cannot run executable found relative to current directory

When I run the packed exe with the absolute path, I get the below error 2025/04/02 22:45:30 failed writing unpacked file: open C:\Users\user\Downloads\Gopacker\calc-out.exe: The process cannot access the file because it is being used by another process.