diff --git a/src/app.py b/src/app.py
index a1c61a2..e7b28bc 100644
--- a/src/app.py
+++ b/src/app.py
@@ -66,10 +66,16 @@ def try_pipeline_standardization_task():
         for task in config["standard"]:
             if task_name == task['name']: 
                 print("start standardization task: "+task_name)
-                cddp.start_standard_job(spark, config, task, False, True, timeout)
-                result, df = cddp.get_dataset_as_json(spark, config, "standard", task, limit)
-                data_str = json.dumps(result)
-                return jsonify({"data": data_str})
+                try:
+                    cddp.start_standard_job(spark, config, task, False, True, timeout)
+                    result, df = cddp.get_dataset_as_json(spark, config, "standard", task, limit)
+                    data_str = json.dumps(result)
+                    if not result:
+                        return jsonify({'error': 'Dataframe not found'}), 404
+                    return jsonify({"data": data_str})
+                except Exception as e:
+                    error = str(e)
+                    return jsonify({'error': error}), 500
         
     return jsonify({'status': 'error', 'message':'task not found'})
 
@@ -103,10 +109,16 @@ def try_pipeline_serving_task():
         for task in config["serving"]:
             if task_name == task['name']: 
                 print("start serving task: "+task['name'])
-                cddp.start_serving_job(spark, config, task, False, True, timeout)
-                result, df = cddp.get_dataset_as_json(spark, config, "serving", task, limit)
-                data_str = json.dumps(result)
-                return jsonify({"data": data_str})
+                try:
+                    cddp.start_serving_job(spark, config, task, False, True, timeout)
+                    result, df = cddp.get_dataset_as_json(spark, config, "serving", task, limit)
+                    data_str = json.dumps(result)
+                    if not result:
+                        return jsonify({'error': 'Dataframe not found'}), 404
+                    return jsonify({"data": data_str})
+                except Exception as e:
+                    error = str(e)
+                    return jsonify({'error': error}), 500
 
     return jsonify({'status': 'error', 'message':'task not found'})
 
diff --git a/web/index.html b/web/index.html
index bb9c32e..d988d5b 100644
--- a/web/index.html
+++ b/web/index.html
@@ -627,6 +627,9 @@ <h2 class="accordion-header" id="flush-headingServing">
                                                 </div>
                                             </div>
 
+                                            <div class="mb-3" id="standard-error-message">
+                                            </div>
+
                                             <div class="row m-2">
                                                 <div class="col-10">
                                                 </div>
@@ -794,6 +797,8 @@ <h2 class="accordion-header" id="flush-headingServing">
                                                 </div>
                                             </div>
 
+                                            <div class="mb-3" id="serving-error-message">
+                                            </div>
 
                                             <div class="row m-2">
                                                 <div class="col-10">
diff --git a/web/index.js b/web/index.js
index 848067d..e72c9c1 100644
--- a/web/index.js
+++ b/web/index.js
@@ -208,6 +208,9 @@ var app = new Vue({
                 timeout: 10
             })
                 .then(function (response) {
+                    var errorElement = document.getElementById('standard-error-message');
+                    errorElement.innerHTML = '';
+                    errorElement.style.display = 'none';
                     that.results["standard"] = that.results["standard"] || {}
                     that.results["standard"][task['name']] = JSON.parse(response.data.data)
                     that.currentPipelineStandardTaskIsRunning = false
@@ -216,6 +219,13 @@ var app = new Vue({
                 })
                 .catch(function (error) {
                     console.log(error);
+                    var errorMessage = error.message;
+                    if (error.response) {
+                      errorMessage = error.response.data.error;
+                    }
+                    var errorElement = document.getElementById('standard-error-message');
+                    errorElement.innerHTML = errorMessage;
+                    errorElement.style.display = 'block';
                     that.currentPipelineStandardTaskIsRunning = false
                 });
         },
@@ -229,6 +239,9 @@ var app = new Vue({
                 timeout: 10
             })
                 .then(function (response) {
+                    var errorElement = document.getElementById('serving-error-message');
+                    errorElement.innerHTML = '';
+                    errorElement.style.display = 'none';
                     that.results["serving"] = that.results["serving"] || {}
                     that.results["serving"][task['name']] = JSON.parse(response.data.data)
                     that.currentPipelineServingTaskIsRunning = false
@@ -237,6 +250,13 @@ var app = new Vue({
                 })
                 .catch(function (error) {
                     console.log(error);
+                    var errorMessage = error.message;
+                    if (error.response) {
+                      errorMessage = error.response.data.error;
+                    }
+                    var errorElement = document.getElementById('serving-error-message');
+                    errorElement.innerHTML = errorMessage;
+                    errorElement.style.display = 'block';
                     that.currentPipelineServingTaskIsRunning = false
                 });
         },