You're getting a compiler error. It happens in strange parts of code that really shouldn't be having a problem. The error looks something like:

C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.15.0_x86__mdqgnx93n4wtt\hardware\arduino\avr\cores\arduino\HardwareSerial.cpp:203:1: internal compiler error: Segmentation fault

}

^

Please submit a full bug report,

with preprocessed source if appropriate.

See http://gcc.gnu.org/bugs.html for instructions.

lto-wrapper.exe: fatal error: C:\Program Files\WindowsApps\ArduinoLLC.ArduinoIDE_1.8.15.0_x86__mdqgnx93n4wtt\hardware\tools\avr/bin/avr-gcc returned 1 exit status

compilation terminated.

c:/program files/windowsapps/arduinollc.arduinoide_1.8.15.0_x86__mdqgnx93n4wtt/hardware/tools/avr/bin/../lib/gcc/avr/5.4.0/../../../../avr/bin/ld.exe: error: lto-wrapper failed

collect2.exe: error: ld returned 1 exit status

What is it, and how do you fix it?