Unable to click drp down even when xpath created correctly

Unable to click drp down even when xpath created correctly,reason i say so when i pasted xpath in chrome,i see xpath detects drop down oranization unit,but when i run on katalon ,i get error unable to read xpath,even i tried putting elay of seconds but no resolution.

Tried with Select by index and click test ibject but both times i get same error as xpath not found

Here is xpath

//select[@class=‘form-control ng-pristine ng-invalid ng-touched’ and @id=‘organizationUnit’]

Here is DOM

Here is DOM


Communicationseng childEngineeringNon Opsorg@testSignalsSupporttest@enggtest@non ops

      <!---->
      <!---->
    </select>

Got the solution from udemy instructor Rahul ,used descendants in xpath ,actually aplication is built using angular 2 and Rahul videos helped ,here is expression

//md-dialog-container[@role=‘dialog’]/descendant::select[position()=1]