I'm working on a project and it was working all fine, but all of a sudden after I compile a sketch, it shows an error "stat /home/admin/builder/arduino-builder/packages/cores: no such file or directory" and also as this error started simultaneously the web editor too stopped recognizing my board.
:o 
Do you still have this issue? I am trying and everything works fine on my end...
Could you share a link directly to your sketch so that others may try it .
Also are you using the same computer and browser you were originally ?
Hi @sukantpatra16,
can you please try again?