i am using fec mode of gnuradio,and this is my grc
when i run the grc i got the message->
Executing: '/usr/bin/python2 -u /home/cdl/gmsk_fec/gmsk_fec.py'
Using Volk machine: sse4_2_32
bits per symbol = 1
M&M clock recovery omega = 10.000000
M&M clock recovery gain mu = 0.175000
M&M clock recovery mu = 0.500000
M&M clock recovery omega rel. limit = 0.005000
frequency error = 0.000000
DEBUG: nout: 32768 nin: 400 ret: 812
DEBUG: nout: 32768 nin: 400 ret: 812
DEBUG: nout: 32768 nin: 400 ret: 812
FATAL: Missing a required length tag on port 0 at item #812
thread[thread-per-block[22]: <block fec_tagged_decoder (8)>]: Missing length tag.
this mean in the fec_decoder block ,there is no length tag,
but the tag debug block message is
Tag Debug:
Input Stream: 00
Offset: 11100 Source: n/a Key: packet_len Value: 50
Offset: 11150 Source: n/a Key: packet_len Value: 50
Offset: 11200 Source: n/a Key: packet_len Value: 50
Offset: 11250 Source: n/a Key: packet_len Value: 50
Offset: 11300 Source: n/a Key: packet_len Value: 50
Offset: 11350 Source: n/a Key: packet_len Value: 50
Offset: 11400 Source: n/a Key: packet_len Value: 50
Offset: 11450 Source: n/a Key: packet_len Value: 50,
i want to know what's the real problem of this grc,and how can i fix this problem
thank you
--Ekko