the problem is that the IMAMEBASEPATH dir in libretro.c-->retro_load_game is setted as
memcpy(IMAMEBASEPATH, info->path, strlen(core_sys_directory) + 1)
but it should be settes as retro_content_directory
memcpy(IMAMEBASEPATH, info->path, strlen(retro_content_directory) + 1);
modifyng this line all works correctly.