How to fix errors? - ToolBar, ActionBar with AndroidX - / Android Tips for Programming beginner

[@mohamedamokranelarras7292]

Thank you so much.

[@02_devendraaparnathi34]

java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167) I got this error how to solve this?

[@YurikoBaggins]

ThreadPoolExecutor is just a class of Java so it's not error i think
i wanna check it so
can you share me your entire source code on GitHub?
is it difficult?