'Flutter Sdk path missing and also run button missing

I developed an app and then closed it. It was working fine before closing. When I powered on my laptop later and started android studio, my app (bbuy) all codes turned black, run option missing and flutter icon is showing crossed. when I searched the flutter sdk path, it was blank, then I reset it, but after saving nothing happens, I again went to the sdk path, but it remained blank, even after trying several times.[enter image description here]

turning black and flutter cross

sdk blank



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