qstringlist index out of range at declaration!

[fatecasino]

I don't know if this is possible...but I get run time error when the program reaches this line:

QStringList numberOfComponentsPerSet, namesOfSets;

QStringList numberOfComponentsPerSet, namesOfSets;

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ASSERT failure in QList<T>::at: "index out of range", file c:\Qt\4.7.4\include/QtCore/../../src/corelib/tools/qlist.h, line 456

How can I be out of range when creating the variables?