Report an Error

  • "I have an error when using Applio, is there any way to report it or find a solution?"

Yes, you can report a bug by going to the issues section (opens in a new tab), click on "new issues", send an image / full text of the Applio CMD and comment how you get the error (in which part, what action perform when getting the message).

You can also go to the report a bug section in Applio to easily record what is happening. Applio tool to record an error


Remember to check the FAQ section, there are some bugs that are still present in the current version of applio and can be found in this section. You can also go to the Discord Server (opens in a new tab) and share your problem in the help channels to get a direct answer!

Common Errors


In the conda installation method, Applio is installed in a conda environment. This enviroment has all the dependencies needed to run RVC/Applio so you don't need to install anything else.

Error Downloading Miniconda

If there are issues automatically downloading Miniconda, download it manually (opens in a new tab) and install it.

Conda Error Building Wheels

If Conda shows an error related to the "Wheels" dependency, check that Visual Studio Build Tools are installed. This requirement it should be installed semi automatically by the installer.

Tensorboard or dependency error

If an error related to Tensorboard occurs, it's likely that no dependencies were installed correctly. Review if you have the latest installer version.

Also, please check if you have done any of the following:

Check 1: Did you install applio in a directory with spaces or non ASCII characters in the path?

If you did, please reinstall applio in a directory without spaces or non ASCII characters in the path. (For example your C: drive root)

Check 2: Did you have the antivirus/firewall enabled during the installation?

If you did, please reinstall applio with the antivirus disabled.

Check 3: Did you open the run-applio.bat file with administrator privileges?

If you did, please open it without administrator privileges.

Situation with Google Colab

Unfortunately, Google Colab is currently unavailable as Google has taken measures to restrict access to Colab services, including Applio. Thanks to our team, we have been able to bring Applio back. More information here.

FFmpeg error/utf8 error

Ensure paths are free of special characters.

Connection Error

Ensure the console (black command line window) is open.

WebUI popup 'Expecting value: line 1 column 1 (char 0)

Disable system LAN proxy/global proxy and refresh.

Cuda error/Cuda out of memory

Adjust batch size for training; for inference, modify settings in Consider upgrading the GPU if needed.

File/memory error(when training)

Reduce "Number of CPU threads" or pre-cut training set to shorter audio files.

Error about llvmlite.dll

Install vc_redist.x64.exe (opens in a new tab) for Windows.

RuntimeError: The expanded size of the tensor...

Delete smaller-sized wav files, then click "train the model" and "train the index."

RuntimeError: The size of tensor a must match...

Avoid changing the sampling rate mid-training. If necessary, change the exp name and train from scratch or copy pitch and features folders to accelerate training.

The filename, directory name, or volume label syntax is incorrect

Make sure to correctly set the path for your dataset before training. Remember that the dataset should not be in a zip file within the Applio/assets/datasets folder.

IndexError: list index out of range

Make sure to use the same sample rate when retraining or when selecting a custom pretrain.


If all else fails, download the precompiled (Zip or Exe) version. This will bring everything ready to start applio without the need to perform the installation.