General :: Build Custom Rom For Vtab Running Into Error 6

Trying to build a custom rom for the vtab running into error 6. here is what i have and what my script is.

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All seems correct but yet its erroring 6.

show_progress(1.000000, 32);
format("ext4", "EMMC", "/dev/block/mmcblk0p2");
mount("ext4", "EMMC", "/dev/block/mmcblk0p2", "/system");
mount("MTD", "system", "/system");
package_extract_dir("system", "/system");
symlink("toolbox", "/system/bin/cat");

[code].....