@bassantaboe 

Share steps & failed result screenshots.

Regards

Shaqeel

Okay here are the steps I did, trying to open a Service portal page out-of-the-box in ServiceNow. It is the Knowledge Portal

1. First I created the test case as image: my test 1

2. Then test runs in Client test runner and actually opens service portal page for few seconds as in image: opens kb

3. Then client test runner turns white as if it is loading as in image: goes like this

4. Then shows that it failed as in image: fails

5. These are test step results as in images: result 1 & results 2

Does this happen due to the rolling back, when rolling back happens, page is closed and that is why stream error occurs?

the solution worked, thank you so much, however, I want to know why the fail on server error should be unchecked?