Rational Resampler - block executor error

I am still trying to learn how GR works.

Coming from Java the idea of being able to do some processing there
interests me.

So I am trying to use a baseband file from SDR++ as a file source, and
process it in such a way that I can get the amplitude in Java. I
presume this would mean reading in the bin file and decoding the bits
to the I and Q values.

The source file is an unmodulated pulse on about 160.7807Mhz about 2
times per second.

Here is my block setup: https://imgur.com/a/B2HqCKc
And a link to the github project with the baseband file :
https://github.com/bigalnz/java_test

The issue I am currently having :

block_executor :error: sched: <block
rational_resampler<IN_T,OUT_T,TAP_T> (1)> is requesting more input
data than we can provide. ninput_items_required = 27862
max_possible_items_available = 8191 If this is a filter, consider
reducing the number of taps.

What is going on here and how do I fix this?

Thanks

Al