Error while receive sms

hi guys,
i am new to app development in mit app inventor
i develop app for sms send and receive.
when i receive sms the error message shown like java.lang.stringindexoutofboundsexception:length=3;index=4
please give me solution for my problem

Hi @gokul_raj

Are you testing this with the companion app or are you building and running your app? If you’re using the companion, which version of the companion are you using?

thanks for your reply
i am using companion app version 2.57b.
can you have any solution for this problem