Drawing from my 3+ years of experience in full-stack application development with a particular emphasis on Flutter, I would be an excellent fit for rectifying the problem in your Flutter app. My proficiency includes writing clean and efficient code, as demonstrated by my numerous projects in Android and mobile app development. The error message you shared is indicative of an issue concerning elements retrieval, a problem that I'm quite experienced in tackling.
In terms of my skill set, I possess an amiable command over languages such as Dart, Java, Node.js and PHP Laravel which have come in handy province giving me a holistic understanding and addressing errors across applications. In addition to my technical expertise, I also hold a bachelor's degree in Computer Science which has given me a strong conceptual foundation and equipped me with problem-solving abilities to provide bespoke solutions to unique challenges.
My work philosophy lies in delivering quality results within the assigned time frame. Hence, you can rely on me to eliminate this bug swiftly and efficiently so your app can regain its smooth functionality. Let us partner up and bring stability back to your application. Looking forward to discussing the project further!