Probably like you just said you're right. My problem maybe it's stack size.
The error linker is :
"Error[e16]: Segment ISTACK (size: 0x60 align: 0) is too long for segment definition. At least 0x4 more bytes needed. The problem occurred while processing the segment placement command "-Z(IDATA)ISTACK+_IDATA_STACK_SIZE#08-_IDATA0_END", where at the moment of placement the available memory ranges were "IDATA:a4-ff" "
For this reason i enabled inside the void functions the XRAMEN and EXSP bit (enabling of XRAM and extended stack pointer), but the problem persist. i have change the attributes of my variables into __xdata and __ixdata but nothing it's changed.....