WiFi_LoRa_32_V3_FactoryTest_V2 compile error

Hello - I am trying to test 2 wawy Lora Communication using 2 WiFI Lora32 V3 boards. Im running the installed example factory test code but getting a compile error -

/Users/caseydobie/Library/Arduino15/packages/Heltec-esp32/tools/esp-xs3/2302/bin/…/lib/gcc/xtensa-esp32s3-elf/12.2.0/…/…/…/…/xtensa-esp32s3-elf/bin/ld: /Users/caseydobie/Library/Caches/arduino/sketches/1A15D146B996BA6996D70F016A44B7AE/sketch/WiFi_LoRa_32_V3_FactoryTest_V2.ino.cpp.o:(.literal._Z5setupv+0x8): undefined reference to `ex_32k_start_cnt’
collect2: error: ld returned 1 exit status

I’m not sure why a supplied test should fail this way. I have installed the Heltec libraries.v 2.1.4

I tried commenting out the offending section - which related to some internal checks and not vital to the ping pong test, which allowed it to compile but then the screens were locked in to LORA MODE 0. I also created 2 different versions with Board IDs 1 and 0 in case that was an issue. But nothing seems to work. Surely this example should ‘work out of the box’?

If anyone has any ideas I would really appreciate it.

Many thanks