The type or namespace name 'ScriptLeaf' could not be found (are you missing a using directive or an assembly reference?)

The type or namespace name 'ScriptLeaf' could not be found (are you missing a using directive or an assembly reference?)

Process completed with exit code 1.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/setup-dotnet@v1. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

.NET Core 3.1 is no longer supported and will not receive security updates in the future. Please refer to https://aka.ms/dotnet-core-support for more information about the .NET support policy.

The using directive for 'NBitcoin.Secp256k1' appeared previously in this namespace