{code}
Close Popup Window
${title_var} Get Window Titles
Log To Console ${title_var}
Select Window title=@{title_var}[1]
Comment Go back to the first window
close window
{code}
{Logs}
TestCase1:UserNameValidation
| FAIL |
No keyword with name 'Select Window' found.
{Logs}
The select window cant be recognised, installed is Selenium2library 3.0.0
NOTE: Selenium2Library has been renamed to SeleniumLibrary since version 3.0. Nowadays Selenium2Library is just a thin wrapper to SeleniumLibrary that eases with transitioning to the new project.
Try Switch Window keyword instead of select window