Error while adding external reference to revo_kart.brsar

[Carbuino]

So basically if was following this guide here: https://www.mariokartboards.com/threads/creating-additional-music-slots-guide.831/ and when I get to Part 1 Step 5, the path changes from:

E:\Nintendo-Hacking\Wii-Stuff\BrawlBox\custom mkw\strm\r_SFC_Plains_n.brstm
to E:\Nintendo-Hacking\Wii-Stuff\BrawlBox\Crate\v0.23\\tmp\04E35AC424EC8FB0.

Confirming the prompt then causes the program to error out and display this message with the title of System.ArgumentOutOfRangeException:

startIndex cannot be larger than length of string. Parameter name: startIndex at System.String.Substring(Int32 startIndex, Int32 length) at BrawlLib.SSBB.ResourceNodes.RSARExtFileNode.set_FullExtPath(String value) at System.Windows.Forms.SoundPackControl.mnuPath_Click(Object sender, EventArgs e) at System.Windows.Forms.SoundPackControl.lstSets_DoubleClick(Object sender, EventArgs e) at System.Windows.Forms.Control.OnDoubleClick(EventArgs e) at System.Windows.Forms.ListView.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

This only seems to happen to me with BrawlCrate as Brawlbox v0.77 and v0.78 don't error out and correctly add the reference.

[fancythedeveloper]

Yea BC isn't too great with BRSARs. I recommend just using BrawlBox until stuff like this gets fixed.