diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 7caaa220..ce18d14d 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,10 +1,19 @@
 # Release History
 
-## 2.5.6 (2020-02-05)
+## 2.5.6 (2020-02-19)
 
 **Added**
 
-- feat: save variables and export data to JSON files when specified `--save-tests`
+- feat: save variables and export data to JSON files (named xx.io.json) when specified `--save-tests`
+
+**Changed**
+
+- change: alter HttpRunner default log_level to WARNING
+
+**Fixed**
+
+- fix: abort test when failed to parse all cases
+- fix: log error when parse failed
 
 ## 2.5.5 (2020-01-06)
 
diff --git a/httprunner/api.py b/httprunner/api.py
index bc13fc81..cb3c862b 100644
--- a/httprunner/api.py
+++ b/httprunner/api.py
@@ -22,7 +22,7 @@ class HttpRunner(object):
 
     """
 
-    def __init__(self, failfast=False, save_tests=False, log_level="INFO", log_file=None):
+    def __init__(self, failfast=False, save_tests=False, log_level="WARNING", log_file=None):
         """ initialize HttpRunner.
 
         Args:
@@ -200,6 +200,10 @@ class HttpRunner(object):
             logger.log_warning("parse failures occurred ...")
             utils.dump_logs(parse_failed_testfiles, project_mapping, "parse_failed")
 
+        if len(parsed_testcases) == 0:
+            logger.log_error("failed to parse all cases, abort.")
+            raise exceptions.ParseTestsFailure
+
         if self.save_tests:
             utils.dump_logs(parsed_testcases, project_mapping, "parsed")
 
@@ -223,7 +227,7 @@ class HttpRunner(object):
             utils.dump_logs(self._summary, project_mapping, "summary")
             # save variables and export data
             vars_out = self.get_vars_out()
-            utils.dump_logs(vars_out, project_mapping, "vars_out")
+            utils.dump_logs(vars_out, project_mapping, "io")
 
         return self._summary
 
diff --git a/httprunner/exceptions.py b/httprunner/exceptions.py
index ad05ea53..17bd8ee1 100644
--- a/httprunner/exceptions.py
+++ b/httprunner/exceptions.py
@@ -11,6 +11,10 @@ class MyBaseFailure(Exception):
     pass
 
 
+class ParseTestsFailure(MyBaseFailure):
+    pass
+
+
 class ValidationFailure(MyBaseFailure):
     pass
 
diff --git a/httprunner/ext/locusts/cli.py b/httprunner/ext/locusts/cli.py
index 90a99a39..24e54abf 100644
--- a/httprunner/ext/locusts/cli.py
+++ b/httprunner/ext/locusts/cli.py
@@ -18,6 +18,7 @@ import multiprocessing
 import os
 import sys
 
+from httprunner import __version__
 from httprunner import logger
 from httprunner.utils import init_sentry_sdk
 
@@ -104,6 +105,7 @@ def run_locusts_with_processes(sys_argv, processes_count):
 def main():
     """ Performance test with locust: parse command line options and run commands.
     """
+    print("HttpRunner version: {}".format(__version__))
     sys.argv[0] = 'locust'
     if len(sys.argv) == 1:
         sys.argv.extend(["-h"])
diff --git a/httprunner/parser.py b/httprunner/parser.py
index 8fc49d8e..f1600d39 100644
--- a/httprunner/parser.py
+++ b/httprunner/parser.py
@@ -7,6 +7,7 @@ import json
 import re
 
 from httprunner import exceptions, utils, loader
+from httprunner import logger
 from httprunner.compat import basestring, numeric_types, str
 
 # use $$ to escape $ notation
@@ -1242,10 +1243,12 @@ def _parse_testcase(testcase, project_mapping, session_variables_set=None):
             "config": prepared_config,
             "teststeps": prepared_testcase_tests
         }
-    except (exceptions.MyBaseFailure, exceptions.MyBaseError):
+    except (exceptions.MyBaseFailure, exceptions.MyBaseError) as ex:
         testcase_type = testcase["type"]
         testcase_path = testcase.get("path")
 
+        logger.log_error("failed to parse testcase: {}, error: {}".format(testcase_path, ex))
+
         global parse_failed_testfiles
         if testcase_type not in parse_failed_testfiles:
             parse_failed_testfiles[testcase_type] = []