Hi Michelle,
If you are using a flowgraph from version 3.8 while running GRC with version 3.9, you may be having the problem described here:
On Mon, 24 Jan 2022 19:55:51 -0500, Michelle wrote:
hello,
I'm using a FIR filter and I have the error : "Param - Taps(taps):
Expression None is invalid for type'complex_vector'."
my taps is : firdes.low_pass ( 1, samp_rate, frec_carrier,
25000,firdes.WIN_HAMMING )
samp_rate and frec_carrier are both variables in my graph.
I don't understand why I have an error. Please could you tell me what I
am doing wrong?
Thank you.
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