Android Studio Emulator is not running my app

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When I try to run my application, Android Studio loads my emulator but it says: "waiting device to come online" forever, then when I try to run my app with the emulator open, It says my emulator is already running and it doesn't launch my app. I already tried to delete the *.lock files and even tried to delete and create another emulator, without success. Can anyone help me to solve this problem? Thanks in advance.

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