[51] Error[e16]: Segment IDATA_Z (size: 0x58 align: 0) is too long for segment definition: IAR workbench

Hi,
I have imported the AT89S52's Keill's c code to IAR workbench, after compiling I am getting this error but in keil it's not showing such error.
/***********This is the error************/
Error[e16]: Segment IDATA_Z (size: 0x58 align: 0) is too long for segment definition. At least 0xf more bytes needed. The problem occurred while processing the
segment placement command "-Z(IDATA)IDATA_I,IDATA_Z,IDATA_N=08-_IDATA0_END", where at the moment of placement the available memory ranges were
"IDATA:b7-ff"
Reserved ranges relevant to this placement:
IDATA:8-9 VREG
IDATA:a-1f IDATA_I
IDATA:21-ff IDATA_I
BIT:0-7 BREG
BIT:80-97 SFR_AN
BIT:a0-b7 SFR_AN

/************************************/

I also think as suggested in error message, it required 0xf more bytes, if we extend this memory, maybe it will be resolved but if to extend the memory, how to do it?
I am new to IAR workbench, Guys kindly give your suggestions and corrections.