I just installed Arduino 1.18.12 and Teensyduino 1.51. I opened the blink example for teensy3.1. The first compile and load was successful, but the second attempt results in a compile error. The only way to get past this is to restart Arduino, but the compile will only work on the first attempt and then fails on all next attempts. The verbose output on the error is shown below. Any suggestions on why this is happening?
C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\e212010\Documents\Arduino\libraries -fqbn=teensy:avr:teensy31:usb=serial,speed=96,opt=o2std,keys=en-us -vid-pid=0X16C0_0X0483 -ide-version=10812 -build-path C:\Users\e212010\AppData\Local\Temp\arduino_build_701067 -warnings=none -build-cache C:\Users\e212010\AppData\Local\Temp\arduino_cache_643651 -verbose C:\Users\e212010\Documents\Arduino\Blink_teensy3\Blink_teensy3.ino
C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\e212010\Documents\Arduino\libraries -fqbn=teensy:avr:teensy31:usb=serial,speed=96,opt=o2std,keys=en-us -vid-pid=0X16C0_0X0483 -ide-version=10812 -build-path C:\Users\e212010\AppData\Local\Temp\arduino_build_701067 -warnings=none -build-cache C:\Users\e212010\AppData\Local\Temp\arduino_cache_643651 -verbose C:\Users\e212010\Documents\Arduino\Blink_teensy3\Blink_teensy3.ino
Using board 'teensy31' from platform in folder: C:\Program Files (x86)\Arduino\hardware\teensy\avr
Using core 'teensy3' from platform in folder: C:\Program Files (x86)\Arduino\hardware\teensy\avr
Detecting libraries used...
Error compiling for board Teensy 3.2 / 3.1.
C:\Program Files (x86)\Arduino\arduino-builder -dump-prefs -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\e212010\Documents\Arduino\libraries -fqbn=teensy:avr:teensy31:usb=serial,speed=96,opt=o2std,keys=en-us -vid-pid=0X16C0_0X0483 -ide-version=10812 -build-path C:\Users\e212010\AppData\Local\Temp\arduino_build_701067 -warnings=none -build-cache C:\Users\e212010\AppData\Local\Temp\arduino_cache_643651 -verbose C:\Users\e212010\Documents\Arduino\Blink_teensy3\Blink_teensy3.ino
C:\Program Files (x86)\Arduino\arduino-builder -compile -logger=machine -hardware C:\Program Files (x86)\Arduino\hardware -tools C:\Program Files (x86)\Arduino\tools-builder -tools C:\Program Files (x86)\Arduino\hardware\tools\avr -built-in-libraries C:\Program Files (x86)\Arduino\libraries -libraries C:\Users\e212010\Documents\Arduino\libraries -fqbn=teensy:avr:teensy31:usb=serial,speed=96,opt=o2std,keys=en-us -vid-pid=0X16C0_0X0483 -ide-version=10812 -build-path C:\Users\e212010\AppData\Local\Temp\arduino_build_701067 -warnings=none -build-cache C:\Users\e212010\AppData\Local\Temp\arduino_cache_643651 -verbose C:\Users\e212010\Documents\Arduino\Blink_teensy3\Blink_teensy3.ino
Using board 'teensy31' from platform in folder: C:\Program Files (x86)\Arduino\hardware\teensy\avr
Using core 'teensy3' from platform in folder: C:\Program Files (x86)\Arduino\hardware\teensy\avr
Detecting libraries used...
Error compiling for board Teensy 3.2 / 3.1.