Text block problem

[Mir_abdul_khalek]

please fix my block

[Mohamed_Tamer]

your text length is only 15 but you are trying to segment more then 15 letters from it.That why this error occurred.
Because 3+15 -1 = 17, even your word length is only 15
You must decrease your length parameter value , the max value you can add is 12.

[ADDYLIN]

if Text length = 15
and start = 3

that means lenghth of remaining text is
15 - 3 = 12 ( maximum )

But you are setting length to 15 ( 3 more than maximum ) thats why the error.

You can in this case select length from 1 to 12

This will work -