/home/runner/work/R3BRoot/R3BRoot/./.github/actions/pre-build/action.yml: (Line: 31, Col: 1, Idx: 1235) - (Line: 31, Col: 1, Idx: 1235): While scanning a simple key, could not find expected ':'.

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)