The question: After compiling run successfully place some time after the operation will be error
This question made me tangle a lot of time, finally found a similar encounter an error, clear enough about the project. This is generally the last generated temporary files and this has caused conflict.
Question two : run button is grayed out, select the box next to the drop-down did not see APP Options
Click the sync project with gradle files button (shown below) sync just fine. I think this might be my offline download file Gradle's sake.
