App Crash Diagnosis and Repair

My mobile/desktop application used to run smoothly, but it now crashes the moment it is launched. I need an experienced developer to dig in, find the root cause, and deliver a solid fix that restores full start-up stability. You will receive the current source code, any crash logs I have captured, and details about the build environment. I expect you to reproduce the issue, trace the fault, implement a clean solution, and test the result across the same platforms where the failure appears. Deliverables • Brief root-cause report explaining the failure • Updated source code with the crash resolved • Rebuilt installable package (APK, EXE, or relevant format) that opens and runs without errors on affected devices Please let me know which debugging tools and frameworks you prefer—whether Android Studio, Xcode, Visual Studio, React Native dev tools, or anything else—so I can prepare the project for a quick handoff.