Cant record the highlighted input data on test studio

Im kinda new to this automation tool, just wanted to ask one of the problems were having when we try to record/capture a certain scenario. 

1. We try to enter this text/data on one of the entry fields:
        "This is the data to be converted into a blank statement"
2. After entering the above, I highlight "This is the" from the entry fields
3. after doing step 2 (highlight on the words are still on), i clicked the button labeled "Convert to Blank"
4. end of test.

now after we run the script, we always have an error  unable to locate the element