What is Type Error?

[Calvin]

Greetings,
	I'm developing a simlator for LCD and get stuck with the Type Error. The 
attached is my LCD.py file, when compile I got the following error:

Traceback (most recent call last):
   File "<string>", line 1, in ?
   File "C:\Python21\LCDSim\start.py", line 5, in ?
     lcd.elastic_energy()
   File "C:\Python21\LCDSim\LCD.py", line 33, in elastic_energy
 
self.__energy[n]=1/2(self.__lc.k1(self.__azimuth[n])*d_azimuth**2+self.__lc.k2(self.__azimuth[n])*d_twist**2 
+self.__lc.k3(self.__azimuth[n])*d_twist**2)
TypeError: object of type 'int' is not callable

could anybody point out how can I solve it, I just got no ideas :(

Thank you (if you can email me, please email me)
-Calvin
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