[Discuss-gnuradio] HIer block---Generate error

[stefosee]

Hi,

i'm trying to create my first hier block following these rules:
http://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioCompanion#Hierarchical-Blocks

but when i'm going to generate the flow graph, i get the error message:

Generate Error: All strings must be XML compatible: Unicode or ASCII, no
NULL bytes or control characters

I also tried a very simple graph like pad
source(float)->throttle(float)->pad sink(float) but i face the same problem.  

throttle rate's value is the value of a parameter i set as sample_rate.

Any advice?
thx






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