[android-developers] What is the combo key press to fix project errors again?

I am working and when I try to run my project it is saying that I have
errors that need correcting. In my project list I see a red x by the
project but when I open it up I have no errors at all in my code. I
remember reading about a key press to use if this happens but I cant
remember. Can anybody help me with this?

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