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<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">Hi,
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<div> Does anybody know why I got this error when I do "./waf configure"?</div>
<div> I am using a Centos machine and I do have the sudo authority.</div>
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Traceback (most recent call last):</p>
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File "./waf", line 163, in ?</p>
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from waflib import Scripting</p>
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File "/home/tarek/jlee700/ndn-cxx/.waf-1.8.5-d178df7a9bb732db109001d6b461550f/waflib/Scripting.py", line 6, in ?</p>
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from waflib import Utils,Configure,Logs,Options,ConfigSet,Context,Errors,Build,Node</p>
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File "/home/tarek/jlee700/ndn-cxx/.waf-1.8.5-d178df7a9bb732db109001d6b461550f/waflib/Utils.py", line 7, in ?</p>
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from collections import deque,defaultdict</p>
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ImportError: cannot import name defaultdict</p>
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<div><font face="Menlo"><span style="font-size: 11px;"><br>
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<div><font face="Menlo"><span style="font-size: 11px;"> Any advice would be appreciated.</span></font></div>
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<div><font face="Menlo"><span style="font-size: 11px;">Best wishes,<br>
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<div>Jongdeog Lee (JD)</div>
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<div>------------------------------------------------</div>
<div><i>Ph.D. Student</i></div>
<div><i>Department of Computer Science</i></div>
<div><i>University of Illinois at Urbana-Champaign</i></div>
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