[ ERROR ] Unexpected error: IOError: [Errno 0] Error

[flywojt]

My tests starts to fall down. Everything worked fine until I update my Windows 10 two days ago. I downgrade windows but this doesn't help. I also tried to upgrade robot framework and selenium2library and this doesn't helped. This bug occurs for every browser I used (chrome, ff and edge).

[ ERROR ] Unexpected error: IOError: [Errno 0] Error
Traceback (most recent call last):
File "c:\python27\lib\site-packages\robot\utils\application.py", line 83, in _execute
rc = self.main(arguments, **options)
File "c:\python27\lib\site-packages\robot\run.py", line 445, in main
result = suite.run(settings)
File "c:\python27\lib\site-packages\robot\running\model.py", line 248, in run
self.visit(runner)
File "c:\python27\lib\site-packages\robot\model\testsuite.py", line 161, in visit
visitor.visit_suite(self)
File "c:\python27\lib\site-packages\robot\model\visitor.py", line 86, in visit_suite
suite.suites.visit(self)
File "c:\python27\lib\site-packages\robot\model\itemlist.py", line 76, in visit
item.visit(visitor)
File "c:\python27\lib\site-packages\robot\model\testsuite.py", line 161, in visit
visitor.visit_suite(self)
File "c:\python27\lib\site-packages\robot\model\visitor.py", line 87, in visit_suite
suite.tests.visit(self)
File "c:\python27\lib\site-packages\robot\model\itemlist.py", line 76, in visit
item.visit(visitor)
File "c:\python27\lib\site-packages\robot\model\testcase.py", line 74, in visit
visitor.visit_test(self)
File "c:\python27\lib\site-packages\robot\running\runner.py", line 159, in visit_test
self._output.end_test(ModelCombiner(test, result))
File "c:\python27\lib\site-packages\robot\output\output.py", line 59, in end_test
LOGGER.end_test(test)
File "c:\python27\lib\site-packages\robot\output\logger.py", line 183, in end_test
logger.end_test(test)
File "c:\python27\lib\site-packages\robot\output\console\verbose.py", line 51, in end_test
self._writer.status(test.status, clear=True)
File "c:\python27\lib\site-packages\robot\output\console\verbose.py", line 114, in status
self._clear_status()
File "c:\python27\lib\site-packages\robot\output\console\verbose.py", line 124, in _clear_status
self._write_info()
File "c:\python27\lib\site-packages\robot\output\console\verbose.py", line 90, in _write_info
self._stdout.write(self._last_info)
File "c:\python27\lib\site-packages\robot\output\console\highlighting.py", line 51, in write
self.stream.write(console_encode(text, stream=self.stream))

[pekkaklarck]

I have no idea idea what's causing this but quick googling showed that others have had similar errors. For example, this looks very similar: tartley/colorama#101

[gonzo60]

From time to time I have this same problem.

[pekkaklarck]

This could be relevant: https://stackoverflow.com/questions/11176724/python-file-operations

[ianlg]

@flywojt have you found a solution to this issue? I'm having the same problem.

[ianlg]

I have just checked my error message is exactly the same as above. I too remember having updated windows 10 then I started to have problems. Does anyone think it has something to do with the win10 update? I tried everything & reinstalled all the components of Robot framework & still no luck.

Noticed the extra text that appear while running the test in pycharm

[flywojt]

@ianlg no, I am not. This must be conected with windows or configuration because on iOS on MAC my tests works fine.

[ianlg]

@flywojt how did you manage to fix the issue you mentioned above?

[pekkaklarck]

More and more people are reporting this issue when using ChromeDriver also on the Slack channel. Based on the accepted answer to the StackOverflow question I already mentioned, this weird IOError: [Errno 0] error occurs on Windows if you read and write to file without using seek between. Based on the traceback included in the description of this issue, the problem occurs on Robot side when it's writing content to the console. Robot itself never reads from console, but could it be that latest versions of ChromeDriver or Chrome have started doing it?

Although it's unlikely that this problem is caused by Robot, we could possibly workaround it by using seek before we write content to the console. Could someone encountering this issue test would adding line

self.stream.seek(0, 2)

right before the line causing the error help?

[pekkaklarck]

Also, has someone encountered this problem without using ChromeDriver? If not, then the real problem clearly is in ChromeDriver or in Chrome itself.

Those encountering the problem with ChromeDriver, do you remember which version started causing it, or could you downgrade to older versions to see when the problem starts appearing? That information could help reporting the problem to ChromeDrivers tracker.

[ianlg]

Hi, I also experienced the problem using firefox & edge

[pekkaklarck]

Thanks for the commend @ianlg! It seems this isn't only an issue with Chrome(Driver) then. Has anyone encountered this when not using Selenium at all? Does it only occur on Windows? Finally, please test does the workaround in my comment above help!

[flywojt]

This bug occurs for every browser I used (chrome, ff and edge). On Mac and iOS my tests works fine so it looks like that this bug is connected with windows.

[pekkaklarck]

Thanks for update @flywojt! Have you encountered the problem when not using Selenium? Can you test updating your Robot installation with the workaround I posted?

[flywojt]

I haven't tried run tests without selenium. I will try this workaround and give you feedback.

[Zac4]

@pekkaklarck The suggested solution doesn't work. File "C:\Python27\lib\site-packages\robot\output\console\highlighting.py", line 52, in write
self.stream.seek(0, 2) you get the below error: IOError: [Errno 22] Invalid argument. However, if changed the argument to self.stream.seek(0, 0), the tests run fine but the original issue still hasn't gone away.

Has anyone found a working solution to this annoying issue?