Traceback (most recent call last):
  File "/usr/local/bin/waf", line 320, in <module>
    Scripting.Main()
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Scripting.py", line 211, in Main
    ret = bld.compile()
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Build.py", line 177, in compile
    ret = executor.start()
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Runner.py", line 241, in start
    if not proc.must_run():
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Task.py", line 196, in must_run
    self.m_dep_sig = self.m_scanner.get_signature(self)
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Scan.py", line 28, in get_signature
    ret = self._get_signature(task)
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Scan.py", line 74, in _get_signature
    return self._get_signature_default_strong(task)
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Scan.py", line 100, in _get_signature_default_strong
    for node in task.m_inputs: add_node_sig(node)
  File "/usr/local/lib/waf-1.1.0-1718388348/wafadmin/Scan.py", line 97, in add_node_sig
    m.update(tree.m_tstamp_variants[variant][node])
KeyError: </home/gjc/projects/ns-3/ns-3-waf/bindings/python/pybindings.py>