Generating: "/usr/local/src/hardware/gnuradio/gnuradio-examples/grc/simple/variable_config_demo.py"
Generate Error: circular dependency caught in sort_variables
>>> Failue
Traceback (most recent call last):
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/grc/gui/ActionHandler.py", line 291, in _handle_action
    generator.write()
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/grc/python/Generator.py", line 66, in write
    open(self.get_file_path(), 'w').write(str(self))
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/grc/python/Generator.py", line 102, in __str__
    variables = self._flow_graph.get_variables()
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/grc/python/FlowGraph.py", line 101, in get_variables
    return expr_utils.sort_objects(variables, lambda v: v.get_id(), lambda v: v.get_var_make())
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/grc/python/expr_utils.py", line 148, in sort_objects
    sorted_ids = sort_variables(id2expr)
  File "/usr/local/lib64/python2.6/site-packages/gnuradio/grc/python/expr_utils.py", line 129, in sort_variables
    if not indep_vars: raise Exception('circular dependency caught in sort_variables')
Exception: circular dependency caught in sort_variables

Executing: "/usr/local/src/hardware/gnuradio/gnuradio-examples/grc/simple/variable_config_demo.py"