System.ArgumentException: Unexpected type 'NullToken' encountered while reading 'environment'. The type 'MappingToken' was expected.
at GitHub.DistributedTask.ObjectTemplating.Tokens.TemplateTokenExtensions.AssertMapping(TemplateToken value, String objectDescription)
at GitHub.DistributedTask.Pipelines.ObjectTemplating.PipelineTemplateConverter.ConvertToStepEnvironment(TemplateContext context, TemplateToken environment, StringComparer keyComparer, Boolean allowExpressions)
at GitHub.DistributedTask.Pipelines.ObjectTemplating.PipelineTemplateConverter.ConvertToStep(TemplateContext context, TemplateToken stepsItem, ReferenceNameBuilder nameBuilder)
at GitHub.DistributedTask.Pipelines.ObjectTemplating.PipelineTemplateConverter.ConvertToSteps(TemplateContext context, TemplateToken steps)
at GitHub.Runner.Worker.ActionManifestManager.ConvertRuns(IExecutionContext executionContext, TemplateContext templateContext, TemplateToken inputsToken, String fileRelativePath, MappingToken outputs)
at GitHub.Runner.Worker.ActionManifestManager.Load(IExecutionContext executionContext, String manifestFile)