I spent a day fighting the same problem. I had been successfully building for android for months then I started getting gradle errors. I thought maybe it was due to project size or upgrading to Unreal 25.3. I reloaded Android Studio, reviewed every build setting, editing ini files, all with no success. Then I backed up my project and deleted the Saved directory. That fixed it.
Very frustrating problem to solve and in hindsight I wish I had started with deleting the Saved and Intermediate folders. So I thought I would share this in case it can help someone else.
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