[Discuss-gnuradio] OFDM frame equalizer length tag

Hi,

I duplicated the OFDM Frame Equalizer block, and all it works, I added a second input port which is connect with another block that is a tagged_stream block. I don't understand the reason of this error:

gr::log :FATAL: frame_equalizer_alix0 - Missing a required length tag on port 1 at item #0
thread[thread-per-block[49]: <block frame_equalizer_alix (17)>]: Missing length tag.

Length tag is there.. any ideas?

Thanks in advance.
Alice