/home/runner/work/hiragana-converter/hiragana-converter/./.github/actions/setup/action.yml: (Line: 15, Col: 5, Idx: 199) - (Line: 15, Col: 5, Idx: 199): While parsing a block mapping, did not find expected key.

System.ArgumentException: Unexpected type '' encountered while reading 'action manifest root'. The type 'MappingToken' was expected. at GitHub.DistributedTask.ObjectTemplating.Tokens.TemplateTokenExtensions.AssertMapping(TemplateToken value, String objectDescription) at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)