[Discuss-gnuradio] length tag key in ofdm_channel_allocator

[lingeswar kandregula]

hi,

i am trying to use the flowgraph "Core elements of an OFDM transmitter" in the ofdm documentation which is there at Gnuradio-3.7 API. i got the following error.

FATAL: Missing a required length tag on port 0 at item #0
thread[thread-per-block[1]: <block ofdm_carrier_allocator_cvc (14)>]: Missing length tag.

how to overcome this..

what to mention in length tag key in ofdm channel allocator.. by default we have "packet_len" in that field.

thanks,

lingeswar