diff --git a/fuel_plugin_builder/CHANGELOG.md b/fuel_plugin_builder/CHANGELOG.md
index 3670b36..e1f2c8e 100644
--- a/fuel_plugin_builder/CHANGELOG.md
+++ b/fuel_plugin_builder/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 ## 1.0.2 (UNRELEASED)
 
+- Show correct message, if 'timeout' field is not specified for task in tasks.yaml
+  https://bugs.launchpad.net/fuel/+bug/1396234
+- Print error messages to stderr instead of stdout
+
 ## 1.0.1 (2014-11-20)
 
 - Show instruction for CentOS if not all requirements are installed
diff --git a/fuel_plugin_builder/fuel_plugin_builder/cli.py b/fuel_plugin_builder/fuel_plugin_builder/cli.py
index cca4047..2e039c8 100644
--- a/fuel_plugin_builder/fuel_plugin_builder/cli.py
+++ b/fuel_plugin_builder/fuel_plugin_builder/cli.py
@@ -16,6 +16,7 @@
 
 import argparse
 import logging
+import six
 import sys
 
 from fuel_plugin_builder import actions
@@ -28,12 +29,25 @@ from fuel_plugin_builder.logger import configure_logger
 logger = logging.getLogger(__name__)
 
 
+def print_err(line):
+    sys.stderr.write(six.text_type(line))
+    sys.stderr.write('\n')
+
+
 def handle_exception(exc):
     logger.exception(exc)
 
     if isinstance(exc, errors.FuelCannotFindCommandError):
-        print(messages.header)
-        print(messages.install_required_packages)
+        print_err(messages.header)
+        print_err(messages.install_required_packages)
+
+    elif isinstance(exc, errors.ValidationError):
+        print_err('Validation failed')
+        print_err(exc)
+
+    else:
+        print_err('Unexpected error')
+        print_err(exc)
 
     sys.exit(-1)
 
diff --git a/fuel_plugin_builder/fuel_plugin_builder/logger.py b/fuel_plugin_builder/fuel_plugin_builder/logger.py
index 85a9650..1f588f9 100644
--- a/fuel_plugin_builder/fuel_plugin_builder/logger.py
+++ b/fuel_plugin_builder/fuel_plugin_builder/logger.py
@@ -20,7 +20,7 @@ import logging
 def configure_logger(debug=False):
     logger = logging.getLogger('fuel_plugin_builder')
 
-    logger.setLevel(logging.INFO)
+    logger.setLevel(logging.CRITICAL)
     if debug:
         logger.setLevel(logging.DEBUG)
 
diff --git a/fuel_plugin_builder/fuel_plugin_builder/tests/test_base_validator.py b/fuel_plugin_builder/fuel_plugin_builder/tests/test_base_validator.py
index b5ab90a..913651f 100644
--- a/fuel_plugin_builder/fuel_plugin_builder/tests/test_base_validator.py
+++ b/fuel_plugin_builder/fuel_plugin_builder/tests/test_base_validator.py
@@ -14,7 +14,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-import jsonschema
 import mock
 
 from fuel_plugin_builder import errors
@@ -32,7 +31,15 @@ class TestBaseValidator(BaseTestCase):
         self.plugin_path = '/tmp/plugin_path'
         self.validator = NewValidator(self.plugin_path)
         self.data = {'data': 'data1'}
-        self.schema = {'schema': 'schema1'}
+        self.schema = self.make_schema(['data'], {'data': {'type': 'string'}})
+
+    @classmethod
+    def make_schema(cls, required, properties):
+        return {
+            '$schema': 'http://json-schema.org/draft-04/schema#',
+            'type': 'object',
+            'required': required,
+            'properties': properties}
 
     @mock.patch('fuel_plugin_builder.validators.base.jsonschema')
     def test_validate_schema(self, schema_mock):
@@ -44,16 +51,38 @@ class TestBaseValidator(BaseTestCase):
             self.data,
             self.schema)
 
-    @mock.patch('fuel_plugin_builder.validators.base.jsonschema.validate',
-                side_effect=jsonschema.exceptions.ValidationError('p1', 'p2'))
-    def test_validate_schema_raises_error(self, validate_mock):
+    def test_validate_schema_raises_error(self):
+        schema = self.make_schema(['key'], {'key': {'type': 'string'}})
+        data = {}
+
         with self.assertRaisesRegexp(
                 errors.ValidationError,
-                'Wrong value format "", for file "file_path", p1'):
-            self.validator.validate_schema(self.data, self.schema, 'file_path')
-        validate_mock.assert_called_once_with(
-            self.data,
-            self.schema)
+                "File 'file_path', 'key' is a required property"):
+            self.validator.validate_schema(data, schema, 'file_path')
+
+    def test_validate_schema_raises_error_path_in_message(self):
+        schema = self.make_schema(
+            ['key'],
+            {'key': {'type': 'array', 'items': {'type': 'string'}}})
+        data = {'key': ['str', 'str', 0]}
+
+        expected_error = ("File 'file_path', 0 is not of type "
+                          "'string', value path 'key -> 2'")
+        with self.assertRaisesRegexp(
+                errors.ValidationError,
+                expected_error):
+            self.validator.validate_schema(data, schema, 'file_path')
+
+    def test_validate_schema_raises_error_custom_value_path(self):
+        schema = self.make_schema(['key'], {'key': {'type': 'string'}})
+        data = {}
+
+        with self.assertRaisesRegexp(
+                errors.ValidationError,
+                "File 'file_path', 'key' is a required property, "
+                "value path '0 -> path2'"):
+            self.validator.validate_schema(
+                data, schema, 'file_path', value_path=[0, 'path2'])
 
     @mock.patch('fuel_plugin_builder.validators.base.utils')
     @mock.patch(
diff --git a/fuel_plugin_builder/fuel_plugin_builder/tests/test_validator_v1.py b/fuel_plugin_builder/fuel_plugin_builder/tests/test_validator_v1.py
index c2473b3..4c49d83 100644
--- a/fuel_plugin_builder/fuel_plugin_builder/tests/test_validator_v1.py
+++ b/fuel_plugin_builder/fuel_plugin_builder/tests/test_validator_v1.py
@@ -65,9 +65,11 @@ class TestValidatorV1(BaseTestCase):
 
         self.assertEqual(
             [mock.call('param1', v1.PUPPET_PARAMETERS,
-                       self.validator.tasks_path),
+                       self.validator.tasks_path,
+                       value_path=[0, 'parameters']),
              mock.call('param2', v1.SHELL_PARAMETERS,
-                       self.validator.tasks_path)],
+                       self.validator.tasks_path,
+                       value_path=[1, 'parameters'])],
             validate_schema_mock.call_args_list)
 
     @mock.patch('fuel_plugin_builder.validators.validator_v1.utils')
diff --git a/fuel_plugin_builder/fuel_plugin_builder/validators/base.py b/fuel_plugin_builder/fuel_plugin_builder/validators/base.py
index c38894c..654d827 100644
--- a/fuel_plugin_builder/fuel_plugin_builder/validators/base.py
+++ b/fuel_plugin_builder/fuel_plugin_builder/validators/base.py
@@ -32,19 +32,32 @@ class BaseValidator(object):
     def __init__(self, plugin_path):
         self.plugin_path = plugin_path
 
-    def validate_schema(self, data, schema, path):
-        logger.debug('Start schema validation for %s file, %s', path, schema)
+    def validate_schema(self, data, schema, file_path, value_path=None):
+        logger.debug(
+            'Start schema validation for %s file, %s', file_path, schema)
+
         try:
             jsonschema.validate(data, schema)
         except jsonschema.exceptions.ValidationError as exc:
-            value_path = ' -> '.join(map(six.text_type, exc.absolute_path))
             raise errors.ValidationError(
-                'Wrong value format "{0}", for file "{1}", {2}'.format(
-                    value_path, path, exc.message))
+                self._make_error_message(exc, file_path, value_path))
 
-    def validate_file_by_schema(self, schema, path):
-        data = utils.parse_yaml(path)
-        self.validate_schema(data, schema, path)
+    def _make_error_message(self, exc, file_path, value_path):
+        error_msg = "File '{0}', {1}".format(file_path, exc.message)
+
+        if value_path is None and exc.absolute_path:
+            value_path = exc.absolute_path
+
+        if value_path:
+            value_path = ' -> '.join(map(six.text_type, value_path))
+            error_msg = '{0}, {1}'.format(
+                error_msg, "value path '{0}'".format(value_path))
+
+        return error_msg
+
+    def validate_file_by_schema(self, schema, file_path):
+        data = utils.parse_yaml(file_path)
+        self.validate_schema(data, schema, file_path)
 
     @abc.abstractmethod
     def validate(self):
diff --git a/fuel_plugin_builder/fuel_plugin_builder/validators/schemas/v1.py b/fuel_plugin_builder/fuel_plugin_builder/validators/schemas/v1.py
index c1e9c00..f6b8e87 100644
--- a/fuel_plugin_builder/fuel_plugin_builder/validators/schemas/v1.py
+++ b/fuel_plugin_builder/fuel_plugin_builder/validators/schemas/v1.py
@@ -69,17 +69,21 @@ SHELL_PARAMETERS = {
         'cmd': {'type': 'string'}}}
 
 
+TASK_BASE_PARAMETERS = {
+    '$schema': 'http://json-schema.org/draft-04/schema#',
+    'type': 'object',
+    'required': ['timeout'],
+    'properties': {
+        'timeout': POSITIVE_INTEGER}}
+
+
 TASK_SCHEMA = {
     '$schema': 'http://json-schema.org/draft-04/schema#',
     'type': 'object',
     'required': ['parameters', 'type', 'stage', 'role'],
     'properties': {
         'type': {'enum': ['puppet', 'shell']},
-        'parameters': {
-            'type': 'object',
-            'oneOf': [
-                PUPPET_PARAMETERS,
-                SHELL_PARAMETERS]},
+        'parameters': TASK_BASE_PARAMETERS,
         'stage': {'enum': ['post_deployment', 'pre_deployment']},
         'role': {
             'oneOf': [
diff --git a/fuel_plugin_builder/fuel_plugin_builder/validators/validator_v1.py b/fuel_plugin_builder/fuel_plugin_builder/validators/validator_v1.py
index b0b44f5..9ce77d3 100644
--- a/fuel_plugin_builder/fuel_plugin_builder/validators/validator_v1.py
+++ b/fuel_plugin_builder/fuel_plugin_builder/validators/validator_v1.py
@@ -54,13 +54,17 @@ class ValidatorV1(BaseValidator):
         logger.debug('Start tasks checking "%s"', self.tasks_path)
         tasks = utils.parse_yaml(self.tasks_path)
 
-        for task in tasks:
+        for idx, task in enumerate(tasks):
             if task['type'] == 'puppet':
                 schema = v1.PUPPET_PARAMETERS
             elif task['type'] == 'shell':
                 schema = v1.SHELL_PARAMETERS
 
-            self.validate_schema(task['parameters'], schema, self.tasks_path)
+            self.validate_schema(
+                task['parameters'],
+                schema,
+                self.tasks_path,
+                value_path=[idx, 'parameters'])
 
     def check_releases_paths(self):
         meta = utils.parse_yaml(self.meta_path)