error in TE

I have a script prefectly run on my local machine with TC.

But if runs on TE at server machine  it gives error........

method is something like..

class revers():
..................................
............................................    
  def updatePay_Last(self):
    Delay(12000,'delay for a while')  #--------the error fired here------------
    Log.Message("Just Loggg")
    Log.Message(str(Project.Variables.VariableExists('RunNoCollect')))
    Log.Message( Project.Variables.GetVariableType('RunNoCollect'))
    Log.Message(str(Project.Variables.RunNoCollect.RowCount)+"........."+str(Project.Variables.RunNoCollect.ColumnCount))
    Log.Message( Project.Variables.GetVariableDescription('RunNoCollect'))
    Log.Message(str(Project.Variables.RunNoCollect.Item[1,2])+" is the problem child...........")
    MyVar = Project.Variables.RunNoCollect
    Iterator = MyVar.Iterator
    # Initializes the iterator
    Iterator.Reset()
    # Iterates through the rows 
    while not Iterator.IsEOF():
      # Returns the column name by its index 
      ColName = MyVar.ColumnName[1]
      # Retrieves values and posts them to the log     
      value = Iterator.Value[ColName]
      Log.Message(value)
      # Forwards the iterator to the next row 
      Iterator.Next()
      
    runNo = Project.Variables.RunNoCollect.Item[1,2]
   ..............
  ...................

def main():
  reversOBJ = revers()
.................................
....................................
  reversOBJ.checkYTDValues('Final')
  reversOBJ.updatePay02()
  reversOBJ.checkRun(Project.Variables.RunNoCollect.Item[1,1],'checkRun02')
  reversOBJ.updatePay_Last() # ---------this is where calling happens---------
  reversOBJ.checkRun(Project.Variables.RunNoCollect.Item[1,2],'checkRun03')
  reversOBJ.checkFinal()

but if I run below no problem...

def just_test():
  reversOBJ = revers()
  reversOBJ.updatePay_Last()

any idea is appreciated..