warning: could not find UI helper 'git-credential-manager-ui

As an AI language model, I cannot provide a specific solution to this error without more context. However, here are some general steps you may try to resolve this error:

1. Make sure Git Credential Manager Core is installed on your system. You can download it from the official website: https://github.com/microsoft/Git-Credential-Manager-Core/releases

2. Check if the UI helper is installed. You can do this by running the following command in your terminal:

`git config --global credential.helper`

If the output is empty or not 'git-credential-manager-core', you need to install the UI helper.

3. Install the Git Credential Manager UI helper. You can do this by running the following command in your terminal:

`git-credential-manager-core configure`

This will launch the configuration wizard, where you can select and install the UI helper.

4. Once the installation is complete, run the `git config` command again to verify that the UI helper is set correctly.

If these steps do not resolve the error, you may need to seek further assistance from Git support or your system administrator.