After a lot of study, i now coded it more correctly (i think) but strangely enough i get the same error message as before. ('int' object is not callable" at t.start() )

Code is:

Qt Code: 
  1. import sys
  2. from PyQt4 import QtCore, QtGui
  3. from calculatorform_ui import Ui_CalculatorForm
  4. from ui_countNumbers import Ui_MainWindow
  5. from time import sleep
  6.  
  7. class WorkerThread(QtCore.QThread):
  8.     def __init__(self, start, end):
  9.         QtCore.QThread.__init__(self)
  10.         self.start = start
  11.         self.end = end
  12.  
  13.     def run(self):
  14.         for x in range(start, end):
  15.             self.emit(QtCore.SIGNAL("updateProgress"), x)
  16.  
  17.  
  18. class CountNumbersForm(QtGui.QMainWindow):
  19.     def __init__(self, parent=None):
  20.         QtGui.QMainWindow.__init__(self, parent)
  21.         self.ui = Ui_MainWindow()
  22.         self.ui.setupUi(self)
  23.  
  24.     @QtCore.pyqtSignature("")
  25.     def on_start_clicked(self):
  26.         worker = WorkerThread(self.ui.spFrom.value(), self.ui.spTo.value() + 1);
  27.         QtCore.QObject.connect(worker, QtCore.SIGNAL("updateProgress"), self.updateProgress, QtCore.Qt.QueuedConnection)
  28.         worker.start()
  29.  
  30.     def updateProgress(self, val):
  31.         self.ui.progres.setValue(val)
  32.  
  33.  
  34. if __name__ == "__main__":
  35.     app = QtGui.QApplication(sys.argv)
  36.     count = CountNumbersForm();
  37.     count.show()
  38.     sys.exit(app.exec_())
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