With over X years of professional experience as a Java Android software developer, I am confident in my ability to tackle any issue thrown my way. Your project revolves around the infamous Dart error, and that just so happens to be one of my specialities. I have an in-depth understanding of OOP, MVC patterns, GUI frameworks, and databases - all skills crucial for solving the issue at hand.
Moreover, my extensive knowledge of Java extends to Android Studio and using Dart. This gives me a considerable edge in navigating your specific problem and finding effective solutions quickly. Providing top-notch results within stipulated timelines has always been my priority, and with your screenshots as a helpful guide, I'm confident we can tackle all issues besetting your project together.
In conclusion, choosing me for this task means enlisting the support of a highly skilled and experienced professional who's no stranger to this particular error and its resolution process. With your permission, I would like to apply my expertise to get your Flutter web app successfully deployed and operational in no time. Looking forward to bringing stability back into your project!