Hooks not working iff im using @ob_start()

Well it's a proven fact that any kind of errors can cause multiple other errors.

So you start by fixing your current errors that you know about then proceed with
the other errors.

And your ob_start should be place above the class under the <php

Thanks, i have done that correction in code that you had suggested previously   . I have changed the position of the ob_start to Under php tag, but still facing that problem.