Hellow, I'm new with the cln library. Before the installation from the version 1.1.11 the follow code worked. ------------------ cl_I intRing = m_strValue.toAscii().constData(); intArg1 = m_sArg1.toAscii().constData(); modintRing = find_modint_ring( intArg1 ); intMod = modintRing->canonhom( intRing ); cout << intRing << "\n"; cout << intArg1 << "\n"; cout << intMod << "\n"; -------------------- but now in this code-line cout << intMod << "\n"; there is a "Segmentation fault" error report. Thanks and best regards, Wilson