I am using danteg9's Boruto Infinity Mugen 2 and I wanted help adding a 3v3 and 4v4 mode but the conventional methods aren't working and I am getting this error when I put the 3v3 and 4v4 modes in:

Error detected.

Can't find file system.sffError loading system data: data/mugen1/system.def

Clipboard tail:
OK
Initializing timer...performance timer enabled...frequency 10000000...OK
Initializing keyboard...configuring...OK
Initializing input engine...OK
Initializing sound...OK
Initializing BGM... OK
Initializing graphics...gameCoord 1280x720...render mode 2_20...trying 1280x720x32 mode 0x0...success...OK
Setting callbacks...OK
Initializing font...OK
Initializing game variables...OK
Session RNG seed is 1589254696
Loading system fonts...OK
Loading options...
Initializing pads...failed
Reinitializing input engine...OK
Remapping keys...OK
Reinitializing input engine...OK
Options loaded OK
Loading system...
Load system file system.def...OK
Load system spr...

Not sure what to do, would appreciate any help.