rm class Error

GUI/Model/Data/DataItem.cpp

GUI/Model/Data/IntensityDataItem.cpp

GUI/Model/Data/SpecularDataItem.cpp

GUI/Model/Device/InstrumentItems.cpp

GUI/Model/Device/RealItem.cpp

GUI/Model/FromCore/ItemizeSimulation.cpp

GUI/Model/Job/FitParameterContainerItem.cpp

GUI/Model/Job/FitSuiteItem.cpp

GUI/Model/Job/JobItem.cpp

GUI/Model/Model/JobModel.cpp

GUI/Model/Model/JobQueueData.cpp

GUI/Model/Model/RealModel.cpp

GUI/Model/Project/ProjectDocument.cpp

GUI/Model/Sample/CoreAndShellItem.cpp

GUI/Model/Sample/MesocrystalItem.cpp

GUI/Model/ToCore/SampleToCore.cpp

GUI/Support/IO/ImportDataInfo.cpp

GUI/Support/Util/Error.cpp

GUI/Support/Util/Error.h

GUI/View/Fit/FitSessionController.cpp