Error using vera.getLine() in Python script

running this 'test' script:

for f in vera.getSourceFileNames(): print vera.getLine(f, 1)

gives error: c:\p4>"c:\p4\vera++\bin\vera++.exe" --rule test Index.h vera++: TypeError: No Python class registered for C++ class class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > File "c:\p4\vera++\lib\vera++/rules/classes_have_doxygen_comment.py", line 2, in <module> print vera.getLine(f, 1)