improper fixup (while using interrupt)

after linking my code I get:
*** ERROR L121: IMPROPER FIXUP
MODULE: prog_fsk.obj (PROG_FSK)
SEGMENT: ABSOLUTE

Everything was OK before untill the moment, when I changed one of my program functions to be ISR.

Here is it's source code:

void CallerId(void) interrupt 0 using 2 {
char c;
int timeout=0;
char i; //licznik petli


while(P3_2==0); //czeka az skonczy sie pierwszy dzwonek

P3_3=0; //przelaczenie CMX 612 w tryb odbioru danych FSK
P3_7=1;

c=_getkey();
while(c!=0x55) //czekamy na blok Chan Seize (ASCII 'U')
{
c=_getkey(); //czym rozni sie getkey od getchar????
timeout++;
if(timeout==10000)
//aktywowac przerwanie INT 1 tylko po co?????????
{dzwonek=0;
return; //nieudana transmisja danych
}
}
timeout=0;
while(c!=0x80) //czekamy na naglowek CLIP (call setup)
{
c=_getkey();
timeout++;
if(timeout==10000)
{ //aktywowac przerwanie INT 1 tylko po co?????????
dzwonek=0;
return; //nieudana transmisja danych
}
}

fsk_tab[0]=c; //"call setup"
c=_getkey();
fsk_tab[1]=c; //liczba bajtow wiadomosci (nie liczac pol "call setup" i "Message Lenght")

for(i=2;i<c+2;i++)
{
fsk_tab[i]=_getkey();
}

P3_3=1; //przelaczenie CMX 612 w tryb "Zero Power"
P3_7=0;
dzwonek=1;
}

and here memory map:

LINK MAP OF MODULE: prog_fsk (PROG_FSK)


TYPE BASE LENGTH RELOCATION SEGMENT NAME
-----------------------------------------------------

* * * * * * * D A T A M E M O R Y * * * * * * *
REG 0000H 0008H ABSOLUTE "REG BANK 0"
DATA 0008H 0006H UNIT _DATA_GROUP_
000EH 0002H *** GAP ***
REG 0010H 0008H ABSOLUTE "REG BANK 2"
DATA 0018H 0050H UNIT ?DT?PROG_FSK
IDATA 0068H 0001H UNIT ?STACK

* * * * * * * C O D E M E M O R Y * * * * * * *
CODE 0000H 0003H ABSOLUTE
CODE 0003H 0002H ABSOLUTE
0005H 07FBH *** GAP ***
CODE 0800H 00F6H UNIT ?C?LIB_CODE
CODE 08F6H 00D9H INBLOCK ?PR?MAIN?PROG_FSK
CODE 09CFH 00B4H INBLOCK ?PR?CALLERID?PROG_FSK
CODE 0A83H 008CH UNIT ?C_C51STARTUP
CODE 0B0FH 0086H INBLOCK ?PR?PRINTCLIP?PROG_FSK
CODE 0B95H 005CH INBLOCK ?PR?SAVECLIP?PROG_FSK
CODE 0BF1H 004DH INBLOCK ?PR?_PRINTWPIS?PROG_FSK
CODE 0C3EH 002DH INBLOCK ?PR?_CHECKSUM?PROG_FSK
CODE 0C6BH 001CH INBLOCK ?PR?_WRITE_DATA?PROG_FSK
CODE 0C87H 0014H INBLOCK ?PR?SERIAL_INIT?PROG_FSK
CODE 0C9BH 000FH INBLOCK ?PR?_WRITE_CMD?PROG_FSK
CODE 0CAAH 000EH INBLOCK ?PR?_WRITE_NIBBLE?PROG_FSK
CODE 0CB8H 000CH INBLOCK ?PR?LCD_INIT?PROG_FSK
CODE 0CC4H 000AH UNIT ?PR?_GETKEY?_GETKEY
CODE 0CCEH 0004H UNIT ?C_INITSEG

Thank you for help,
Wojtek


PS I'm using Keil Evaluation
Project settings:
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