Class referenced in the layout file, com.jstarczewski.pc.mathview.src.MathView, was not found in the project or the libraries

[stevealo]

Hi I am new to Android programming, I tried to using your library. But is gives me the following error
"Class referenced in the layout file, com.jstarczewski.pc.mathview.src.MathView, was not found in the project or the libraries" in my file layout even after I had included the
maven { url 'https://jitpack.io' } in the project repositories in Gradle (Project ) and implementation 'com.github.jstarczewski:MathView:0.4.0' in the Gradle app, what am I getting wrong?

I have synced my project several times