Hello Jenny, I can try to help you, but I'm not quite sure if I am right. If I am wrong I will be corrected soon.
> >> Generating: "/home/jenny/Tutorials/rx_ofdm.py" > >> Executing: "/home/jenny/Tutorials/rx_ofdm.py" > >> Using Volk machine: sse4_2_64_orc > >> gr::log :FATAL: geese_vcvc0 - Missing a required length tag on port 1 at > >> item #0 > >> thread[thread-per-block[46]: <block geese_vcvc (1)>]: Missing length tag. This error tells you that your block is missing a length tag in one of his inputs. A Stream Tag on the first sample is a requirement for a tagged stream block. This Stream Tag has to provide information about how much input data your block has to process. I assume you don't have an tagged stream on each of your inputs and this causes a problem for your tagged stream block. Best you provide a screenshot of your example flowgraph (the relevant parts). Based on the error it is nothing inside of your block but the way you are trying to feed it with samples. Best Regards, Andrej
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