ROBOCOPY ERROR 5 (0x00000005) Accessing Source Directory Access is denied

i am using robocopy in php code to copy a file from one server to another.
but whenever i try to copy file from/to outside the xampp it’s through an error
ERROR 5 (0x00000005) Accessing Source Directory Access is denied

this is my code
$output = shell_exec(‘robocopy c:Userskhushi.agarwalDesktop “.” “QOH2.xlsx”‘);
echo “

$output

“;
echo ‘
‘;

output

ROBOCOPY :: Robust File Copy for Windows

Started : Tuesday, May 3, 2022 2:55:34 PM
Source : c:Userskhushi.agarwalDesktop
Dest : C:xampphtdocskhushiphpseclib

Files : QOH2.xlsx
    

Options : /DCOPY:DA /COPY:DAT /R:1000000 /W:30

---

2022/05/03 14:55:34 ERROR 5 (0x00000005) Accessing Source Directory c:Userskhushi.agarwalDesktop
Access is denied