.

src/Runner.Worker/ActionManifestManager.cs

@@ -1,16 +1,16 @@
 using System;
 using System.Collections.Generic;
 using System.IO;
-using System.Threading;
-using GitHub.Runner.Common;
-using GitHub.Runner.Sdk;
+using System.Linq;
 using System.Reflection;
-using GitHub.DistributedTask.Pipelines.ObjectTemplating;
-using GitHub.DistributedTask.ObjectTemplating.Schema;
+using System.Threading;
 using GitHub.DistributedTask.ObjectTemplating;
+using GitHub.DistributedTask.ObjectTemplating.Schema;
 using GitHub.DistributedTask.ObjectTemplating.Tokens;
 using GitHub.DistributedTask.Pipelines.ContextData;
-using System.Linq;
+using GitHub.DistributedTask.Pipelines.ObjectTemplating;
+using GitHub.Runner.Common;
+using GitHub.Runner.Sdk;
 using Pipelines = GitHub.DistributedTask.Pipelines;
 
 namespace GitHub.Runner.Worker
@@ -130,7 +130,7 @@ namespace GitHub.Runner.Worker
                     actionDefinition.Execution = ConvertRuns(executionContext, templateContext, actionRunValueToken, fileRelativePath, actionOutputs);
                 }
             }
-            catch (Exception ex)
+            catch (Exception ex) when (!(ex is TemplateValidationException))
             {
                 Trace.Error(ex);
                 templateContext.Errors.Add(ex);
@@ -141,7 +141,7 @@ namespace GitHub.Runner.Worker
                 foreach (var error in templateContext.Errors)
                 {
                     Trace.Error($"Action.yml load error: {error.Message}");
-                    executionContext.Error("And let's duplicate errors: " + error.Message);
+                    executionContext.Error(error.Message);
                 }
 
                 throw new ArgumentException($"Fail to load {fileRelativePath}");
@@ -416,7 +416,14 @@ namespace GitHub.Runner.Worker
                         break;
                     case "steps":
                         var stepsToken = run.Value.AssertSequence("steps");
-                        steps = PipelineTemplateConverter.ConvertToSteps(templateContext, stepsToken);
+                        try
+                        {
+                            steps = PipelineTemplateConverter.ConvertToSteps(templateContext, stepsToken);
+                        }
+                        catch (Exception ex) when (!(ex is TemplateValidationException))
+                        {
+                            templateContext.Errors.Add(ex);
+                        }
                         templateContext.Errors.Check();
                         break;
                     default:

src/Runner.Worker/ExecutionContext.cs

@@ -1401,7 +1401,7 @@ namespace GitHub.Runner.Worker
 
         public void Error(string format, params Object[] args)
         {
-            _executionContext.Error("error from template trace writer: " + string.Format(CultureInfo.CurrentCulture, format, args));
+            _executionContext.Error(string.Format(CultureInfo.CurrentCulture, format, args));
         }
 
         public void Info(string format, params Object[] args)

src/Sdk/DTObjectTemplating/ObjectTemplating/TemplateEvaluator.cs

@@ -287,7 +287,7 @@ namespace GitHub.DistributedTask.ObjectTemplating
                     {
                         if (!keys.Contains(property.Key))
                         {
-                            m_context.Error(mapping,  "Template evaluator error " + $"Required property is missing: {property.Key}");
+                            m_context.Error(mapping, $"Required property is missing: {property.Key}");
                         }
                     }
                 }

src/Sdk/DTObjectTemplating/ObjectTemplating/TemplateReader.cs

@@ -279,7 +279,7 @@ namespace GitHub.DistributedTask.ObjectTemplating
                 nonDuplicates.Sort();
 
                 String listToDeDuplicate = String.Join(", ", nonDuplicates);
-                m_context.Error(mapping, "Template reader error: " + TemplateStrings.UnableToDetermineOneOf(listToDeDuplicate));
+                m_context.Error(mapping, TemplateStrings.UnableToDetermineOneOf(listToDeDuplicate));
             }
             else if (mappingDefinitions.Count == 1 && !hasExpressionKey)
             {
@@ -289,7 +289,7 @@ namespace GitHub.DistributedTask.ObjectTemplating
                     {
                         if (!keys.Contains(property.Key))
                         {
-                            m_context.Error(mapping, "Template Reader error " + $"Required property is missing: {property.Key}");
+                            m_context.Error(mapping, $"Required property is missing: {property.Key}");
                         }
                     }
                 }