Warning when adding a subproject using a JSON wizard

I getting every time warnings of
bool JsonWizardFileGenerator::allDone(const JsonWizard *wizard, Core::GeneratedFile *file, QString *errorMessage)
function ( https://qt.gitorious.org/qt-creator/qt-creator/source/50fe3585a890fdbb5b6b8598bd8ffe97c036b52d:src/plugins/projectexplorer/jsonwizard/jsonwizardfilegenerator.cpp#L208 ) : it warns me about failed try to open subproject. But I am already successfully add subproject to my project tree. BTW, I trying to add new subproject by clicking RMB->"New subproject..."

Here is my function in what my plugin perform add subprojects: http://pastebin.com/pcAzAXG6 .

Please tell me where I need to dig to solve my problem?