Action failed with "The process '/usr/bin/git' failed with exit code 128"

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v2, actions/setup-dotnet@v1, peaceiris/actions-gh-pages@v3.6.1. Actions will be forced to run with Node.js 24 by default starting June 2nd, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Possible null reference argument for parameter 'parent' in 'Node.Node(int start, int end, int alphabetSize, Node parent, int? label = null)'.

Cannot convert null literal to non-nullable reference type.

Dereference of a possibly null reference.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

Cannot convert null literal to non-nullable reference type.

Non-nullable property 'MappedSequence' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'IndexToChar' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Non-nullable property 'CharToIndex' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.