Strange compile error (VS Code/WeMos Mini)

For some strange reason I get this Compiler error and have no idea what to look for:

xtensa-lx106-elf-ar: .pio\build\d1_mini_lite\libFrameworkArduino.a: error reading .pio\build\d1_mini_lite\FrameworkArduino\Esp-frag.cpp.o: Invalid argument
*** [.pio\build\d1_mini_lite\libFrameworkArduino.a] Error 1

Any hint appreciated.


Whatever it was: After changing the framework to another one and switching it back to Arduino, it works again. Obviously something got screwed up behind the scenes.

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