Hellow, I am new in Teensy, I have some errors compiling for board Teensy++ 2.0 DISK SDCARD + Keyboard:

arduino-1.8.10-windows
Windows 10
TeensyLoader 1.48
Teensy++ 2.0
(Compiling Blink program example)

c:\program files (x86)\arduino\hardware\tools\avr\avr\include\stdli b.h: In function 'malloc':

C:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy\mal loc.c:134:7: warning: 'sfp2' may be used uninitialized in this function [-Wmaybe-uninitialized]

if (sfp2)

^

C:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy\mal loc.c:76:40: note: 'sfp2' was declared here

struct __freelist *fp1, *fp2, *sfp1, *sfp2;

^~~~

C:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy\mal loc.c:151:6: warning: 'sfp1' may be used uninitialized in this function [-Wmaybe-uninitialized]

cp += s;

~~~^~~~

C:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy\mal loc.c:76:33: note: 'sfp1' was declared here

struct __freelist *fp1, *fp2, *sfp1, *sfp2;

^~~~

In file included from C:\Program Files (x86)\Arduino\hardware\teensy\avr\cores\teensy\usb _api.cpp:8:0:

c:\program files (x86)\arduino\hardware\teensy\avr\cores\usb_disk\u sb_api.cpp: In member function 'uint8_t usb_keyboard_class::unicode_to_keycode(uint16_t)':

c:\program files (x86)\arduino\hardware\teensy\avr\cores\usb_disk\u sb_api.cpp:85:38: warning: large integer implicitly truncated to unsigned type [-Woverflow]

if (cpoint == 10) return KEY_ENTER & 0x3FFF;

C:\Users\mihao\AppData\Local\Temp\arduino_build_89 7138/core\core.a(usb.c.o): In function `sd_command':

usb.c.text.sd_command+0x18): undefined reference to `spi_select'

C:\Users\mihao\AppData\Local\Temp\arduino_build_89 7138/core\core.a(usb.c.o): In function `media_poll':

usb.c.text.media_poll+0x14): undefined reference to `spi_select'

usb.c.text.media_poll+0x36): undefined reference to `sd_deselect'

usb.c.text.media_poll+0x88): undefined reference to `sd_deselect'

usb.c.text.media_poll+0xb6): undefined reference to `sd_deselect'

usb.c.text.media_poll+0x10e): undefined reference to `sd_deselect'

C:\Users\mihao\AppData\Local\Temp\arduino_build_89 7138/core\core.a(usb.c.o): In function `__vector_11':

usb.c.text.__vector_11+0x6b8): undefined reference to `media_size'

usb.c.text.__vector_11+0x710): undefined reference to `media_size'

usb.c.text.__vector_11+0xa0a): undefined reference to `sd_deselect'

usb.c.text.__vector_11+0xbaa): undefined reference to `sd_deselect'

collect2.exe: error: ld returned 1 exit status

Error compiling for board Teensy++ 2.0.