Hi,

I am trying to transmit and receive a .png file through OFDM (Block diagram 
attached). The file size is only 1.5kB. While running I am getting the below 
warning & error in console. Can someone point out the reason behind the error 
and what I am doing wrong. I am a beginner and just started to learn the 
Gnuradio from tutorials.

linux; GNU C++ version 7.3.0; Boost_106501; UHD_003.010.003.000-0-unknown

-- Detected Device: B210
-- Operating over USB 2.
-- Initialize CODEC control...
-- Initialize Radio control...
-- Performing register loopback test... pass
-- Performing register loopback test... pass
-- Performing CODEC loopback test... pass
-- Performing CODEC loopback test... pass
-- Setting master clock rate selection to 'automatic'.
-- Asking for clock rate 16.000000 MHz...
-- Actually got clock rate 16.000000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
-- Asking for clock rate 32.768000 MHz...
-- Actually got clock rate 32.768000 MHz.
-- Performing timer loopback test... pass
-- Performing timer loopback test... pass
gr::log :WARN: ofdm_mapper_bcv0 - The gr::digital::ofdm_mapper_bcv block has 
been deprecated.
gr::log :WARN: ofdm_insert_preamble0 - The gr::digital::ofdm_insert_preamble 
block has been deprecated.
gr::log :WARN: ofdm_sampler0 - The gr::digital::ofdm_sampler block has been 
deprecated.
gr::log :WARN: ofdm_frame_acquisition0 - The 
gr::digital::ofdm_frame_acquisition block has been deprecated.
gr::log :WARN: ofdm_frame_sink0 - The gr::digital::ofdm_frame_sync block has 
been deprecated.
Warning: the blks2.packet_encoder block is deprecated.
Warning: the blks2.packet_decoder block is deprecated.

UHD Error:
    recv packet demuxer unexpected sid 0x330006

UHD Error:
    recv packet demuxer unexpected sid 0x49bf846e
DU
>>> Done (return code -9)





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