Failed tests are marked as "error" instead of "failed" in report

use exists() instead of wait()

Just did it. It is very strange, but after I changed wait() to exists(), test which should fail somehow passed.
Although web browser is in fullscreen mode and I'm sure that image within "exists()" is absent on the screen.
I've tried 2 options:
1. exists("image.jpg")
2. exists(Pattern("image.jpg").similar(99))

Unfortunately, result was the same. What could cause it? Could it be some mistake in the code?
Because, at the same time, "wait()" instead of "exists()" clearly see that image is absent on the screen, just with wrong resolution ("error" instead of "failed")

To be more accurate, I'm providing code of both modules:

1. testScenarios.py:

import org.sikuli.script.SikulixForJython
from sikuli import *
import unittest

class TestsBasic (unittest.TestCase):
    def setUp(self):
        click("browser_icon.jpg")
        wait(2)
        type("f", Key.CTRL + Key.CMD)
        wait(5)
        click("url.jpg")
        type("my-site.com" + Key.ENTER)
        wait(5)
    def test_example(self):
        wait("password_field_safari.jpg")
    def test_negative_example(self):
        exists(Pattern("result_popup.jpg").similar(99))
    def test_negative_example2(self):
        exists("result_popup.jpg")
    def tearDown(self):
        type("q", Key.CMD)
        wait(2)
        click("quit.jpg")

2. main.py:

import unittest
import HTMLTestRunner
from testScenarios import *

suite = unittest.TestLoader().loadTestsFromTestCase(TestsBasic)
outfile = open("/Users/zhenya/Desktop/Report.html", "w")
runner = HTMLTestRunner.HTMLTestRunner(stream=outfile, title='TestsBasic report', description='description')
runner.run(suite)

test_negative_example and test_negative_example2 should return "Failed" result, because "result_popup" image is absent on the screen during their run - but they return "Passed" instead. when I used wait(), they were returning "Error" result.

Thanks RaiMan, that solved my question.