Vocal Separation: Unable to find a suitable output format for 'D:\SSD'

I'm a noob, but had been using RVC for a while with no issues. Suddenly I absolutely cannot get the vocal separation to work. Every time I run it, I get the exact same issue. Any help would be greatly appreciated. I've searched on here, reddit, and youtube but haven't found a solution.

ffmpeg version n4.3.2-160-gfbb9368226 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 9.3-win32 (GCC) 20200320
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-zlib --enable-libxml2 --enable-libfreetype --enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-opencl --enable-libvmaf --disable-vulkan --enable-libvorbis --enable-amf --enable-libaom --disable-avisynth --enable-libdav1d --disable-libdavs2 --enable-ffnvcodec --enable-cuda-llvm --disable-libglslang --enable-libass --enable-libbluray --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvpx --enable-libwebp --disable-lv2 --enable-libmfx --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-librav1e --disable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libtwolame --disable-libvidstab --disable-libx264 --disable-libx265 --disable-libxavs2 --disable-libxvid --enable-libzimg --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-libs=-lgomp
libavutil 56. 51.100 / 56. 51.100
libavcodec 58. 91.100 / 58. 91.100
libavformat 58. 45.100 / 58. 45.100
libavdevice 58. 10.100 / 58. 10.100
libavfilter 7. 85.100 / 7. 85.100
libswscale 5. 7.100 / 5. 7.100
libswresample 3. 7.100 / 3. 7.100
Input #0, mp3, from 'C:\Users\ben-h\AppData\Local\Temp\thooqalahms.mp3':
Metadata:
title : Thomas Giles - Hypoxia (OFFICIAL)
encoder : Lavf58.29.100
Duration: 00:05:06.79, start: 0.023021, bitrate: 128 kb/s
Stream #0:0: Audio: mp3, 48000 Hz, stereo, fltp, 128 kb/s
Metadata:
encoder : Lavf
Stream #0:1: Video: mjpeg (Baseline), yuvj420p(pc, bt470bg/unknown/unknown), 320x179, 90k tbr, 90k tbn, 90k tbc (attached pic)
Metadata:
comment : Other
[NULL @ 000001fde9ee70c0] Unable to find a suitable output format for 'D:\SSD'
D:\SSD: Invalid argument
clean_empty_cache

Start by reproducing vocal separation with the Windows output path D:\SSD and review the FFmpeg error in this issue. Trace the vocal-separation entry point to find how the output path is passed to FFmpeg. Done means separation completes successfully for that path, with a regression test if the existing test structure supports it.