Error when running single test case

[ducminhgd]

It's OK if choose "run all" or "run selected" with the script file selected, but when I choose a test case then click "run selected", an error occured:

Traceback (most recent call last): File "manage.py", line 10, in execute_from_command_line(sys.argv) File "/usr/local/lib/python2.7/dist-packages/django/core/management/init.py", line 399, in execute_from_command_line utility.execute() File "/usr/local/lib/python2.7/dist-packages/django/core/management/init.py", line 392, in execute self.fetch_command(subcommand).run_from_argv(self.argv) File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/test.py", line 50, in run_from_argv super(Command, self).run_from_argv(argv) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 242, in run_from_argv self.execute(_args, *_options.dict) File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/test.py", line 71, in execute super(Command, self).execute(_args, *_options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/base.py", line 285, in execute output = self.handle(_args, *_options) File "/usr/local/lib/python2.7/dist-packages/django/core/management/commands/test.py", line 88, in handle failures = test_runner.run_tests(test_labels) File "/usr/local/lib/python2.7/dist-packages/django/test/runner.py", line 144, in run_tests suite = self.build_suite(test_labels, extra_tests) File "/usr/local/lib/python2.7/dist-packages/django/test/runner.py", line 63, in build_suite tests = self.test_loader.loadTestsFromName(label) File "/usr/lib/python2.7/unittest/loader.py", line 91, in loadTestsFromName module = import('.'.join(parts_copy)) ImportError: No module named myapp