Missing tracks

i am facing a problem in rekordbox dj 4.1  which is i can't relocate the missing files .when i right click the missing file and press relocate i write the name of the missing file in the search field in the pop-up box to find the path of the missing file,the weird thing is that the tracks are not selectable in the search box???!! plz help.this is happening after i updated to 4.1 vers. and i updated my macbook to 10.11.4 OS X el capitan.thx