Help for no building with visual studio code

PlatformIO IDE
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1

hi i have some trouble while i compile my code. and i recieve that type of error:

c:/.platformio/packages/toolchain-xtensa-esp32s3/bin/…/lib/gcc/xtensa-esp32s3-elf/8.4.0/…/…/…/…/xtensa-esp32s3-elf/bin/ld.exe: .pio\build\arduino_nano_esp32\libFrameworkArduino.a(main.cpp.o):(.literal._Z8loopTaskPv+0x8): undefined reference to setup()' c:/.platformio/packages/toolchain-xtensa-esp32s3/bin/../lib/gcc/xtensa-esp32s3-elf/8.4.0/../../../../xtensa-esp32s3-elf/bin/ld.exe: .pio\build\arduino_nano_esp32\libFrameworkArduino.a(main.cpp.o):(.literal._Z8loopTaskPv+0xc): undefined reference to loop()’
c:/.platformio/packages/toolchain-xtensa-esp32s3/bin/…/lib/gcc/xtensa-esp32s3-elf/8.4.0/…/…/…/…/xtensa-esp32s3-elf/bin/ld.exe: .pio\build\arduino_nano_esp32\libFrameworkArduino.a(main.cpp.o): in function loopTask(void*)': C:/.platformio/packages/framework-arduinoespressif32/cores/esp32/main.cpp:42: undefined reference to setup()’
c:/.platformio/packages/toolchain-xtensa-esp32s3/bin/…/lib/gcc/xtensa-esp32s3-elf/8.4.0/…/…/…/…/xtensa-esp32s3-elf/bin/ld.exe: C:/.platformio/packages/framework-arduinoespressif32/cores/esp32/main.cpp:48: undefined reference to `loop()’
collect2.exe: error: ld returned 1 exit status
*** [.pio\build\arduino_nano_esp32\firmware.elf] Error 1

can someone help me?