java.lang.NullPointerException: Cannot invoke "String.charAt(int)" because "inData" is nul

[Akash Arun Tayade]

I didn't get the waveform it is distorted and this message poped up

[Joel Murphy]

@Akash12233
Your question is kinda vague, and I don't see any message in your post.
Please provide a clear description of the problem or bug so that I can help troubleshoot with you.