calling function using parameter is not working

showing error while using parameter , below error

i can possible to call below and works fine .

DefineDLLFunc: "ConsoleApplication10.dll", int, "getP";

print("sum =",getParvathy());

But

DefineDLLFunc: "ConsoleApplication10.dll", int, "getP",int ,int;

print("sum =",getPa(10,12));

ERROR

<<exception>>
Address: 0x65641407 ( 1701057543 )
Code: 0xC0000005 ( -1073741819 )
Continuable: 0x00000000 ( 0 )
Description: Instraction for adress "0x
ErrorCode: 0xC0000005 ( -1073741819 )
ExceptionType: 0x00000000 ( 0 )
Module: C:\Documents and Settings\All Users\Application Data\TS Support\MultiCharts\StudyServer\Studies\Dlls\Indicators\i_my_indicator.dll
Process: C:\Program Files\TS Support\MultiCharts\MultiCharts.exe
Thread ID: 0x000013F4 ( 5108 )
Time: 27.05.2012 - 01:36:02.768