Format mySD card

I’m trying to format my SD card with the attached code:

However, when I run the code the following section gives me a message:
// install the utility to format in EXT4
exitCode = opkg.runShellCommand(F(“opkg install e2fsprogs dosfstools fdisk rsync kmod-fs-ext4”));
if (exitCode != SUCCESSFUL_EXIT_CODE) {
Serial.print("\nExit code");
Serial.println(exitCode);
Serial.println(F(“err. installing e2fsprogs dosfstools fdisk rsync kmod-fs-ext4”));
debugProcess(opkg);
halt();
}
Serial.println(F(“e2fsprogs dosfstools fdisk rsync kmod-fs-ext4 installed”));
}

Message:
err. installing e2fsprogs dosfstools fdisk rsync kmod-fs-ext4

every time the returned exitCode is given as 255, while the SUCCESSFUL_EXIT_CODE IS 0.

How do i get past this issue?

The response I get from the serial monitor is:
This sketch will format your micro SD card and use it as additional disk space for your Arduino Yun.
Please ensure you have ONLY your micro SD card plugged in: no pen drives, hard drives or whatever.
Do you wish to proceed (yes/no)? answer yes

Starting Bridge…

Ready to install utility software. Please ensure your Arduino Yun is connected to internet.
Ready to proceed (yes/no)? answer yes
Updating software list…
Software list updated. Installing software (this will take a while)…

Exit code255
err. installing e2fsprogs dosfstools fdisk rsync kmod-fs-ext4

sketch_sep21b.ino (8.43 KB)

Can someone please respond?