Getting error when run `./run_tests.sh`

[Sergei Bogolepov]

traceback:

Running login... success
Running test_check_version... success
Running choose_general_channel... success
Running test_pasting_string_from_clipboard... success
Running test_pasting_file_from_clipboard... Traceback (most recent call last):
  File "rc_tests.py", line 153, in <module>
    main()
  File "rc_tests.py", line 149, in main
    test_cases.run()
  File "/home/sergei/projects/rocketchat-tests-based-on-splinter/base.py", line 103, in run
    method()
  File "rc_tests.py", line 72, in test_pasting_file_from_clipboard
    self._copy_image_to_clipboard()
  File "rc_tests.py", line 53, in _copy_image_to_clipboard
    self.choose_general_channel()
  File "/home/sergei/projects/rocketchat-tests-based-on-splinter/base.py", line 193, in choose_general_channel
    general_channel[0].click()
  File "/home/sergei/projects/rocketchat-tests-based-on-splinter/venv/lib/python3.5/site-packages/selenium/webdriver/remote/webelement.py", line 80, in click
    self._execute(Command.CLICK_ELEMENT)
  File "/home/sergei/projects/rocketchat-tests-based-on-splinter/venv/lib/python3.5/site-packages/selenium/webdriver/remote/webelement.py", line 633, in _execute
    return self._parent.execute(command, params)
  File "/home/sergei/projects/rocketchat-tests-based-on-splinter/venv/lib/python3.5/site-packages/selenium/webdriver/remote/webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "/home/sergei/projects/rocketchat-tests-based-on-splinter/venv/lib/python3.5/site-packages/selenium/webdriver/remote/errorhandler.py", line 242, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: unknown error: Element <div class="sidebar-item__ellipsis">...</div> is not clickable at point (100, 112). Other element would receive the click: <div class="rc-modal-wrapper">...</div>
  (Session info: chrome=70.0.3538.77)
  (Driver info: chromedriver=2.40.565383 (76257d1ab79276b2d53ee976b2c3e3b9f335cde7),platform=Linux 4.15.0-36-generic x86_64)