All my work is gone. Please help!

I finished something on flutter past night, and closed my tab. Woke up this morning to deliver the apk, but the file project won’t build cause the android sdk is not accessible. So I copied that into a new folder I created. I decided to rebuild the environment cause everything was working fine before. I edited the dev.nix file so that the rebuild environment could show up. When rebuilding it said it has to do recovery. it did, then upon starting, all my files and work is gone except the new folder for my android studio.

I even edited the project, nothing changed

error looks like ?
Could not determine the dependencies of task ‘:flutter_keyboard_visibility:generateDebugRFile’.

Failed to install the following SDK components:
platforms;android-31 Android SDK Platform 31
The SDK directory is not writable (/nix/store/0wqd5nfc2hlx13davkvq2zf3zcy0wr61-androidsdk/libexec/android-sdk)

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When you say all my files and work are gone, which folders are you referring to?