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Traceback (most recent call last):

  File "/usr/local/lib/pythonlib/KSP.py", line 150, in output
    print y[1]()
  File "/var/www/htdocs/product_catalog/valve_selection_guide.ksp", line 97, in doSelectionGuide
    sortedKeys.sort(res_compare)
  File "/var/www/htdocs/product_catalog/valve_selection_guide.ksp", line 81, in res_compare
    if port(f['PORT']) > port(s['PORT']) :
  File "/var/www/htdocs/product_catalog/valve_selection_guide.ksp", line 65, in port
    ret += len(psl)
UnboundLocalError: local variable 'ret' referenced before assignment
None