Android build error 'Failed to read androiddebugkey from store'

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http://stackoverflow.com – I'm trying to build this open source android project but am getting this gradle build error Gradle: Execution failed for task ':public:mbw:packageDevDebug'. Failed to read key androiddebugkey from store "/Users/tester/Downloads/wallet-master3/keystore_debug": null At first it was saying "> File '/Users/tester/Downloads/wallet-master3/keystore_debug' specified for property 'signingConfig.storeFile' does not exist." So i created a blank keystore_debug text file and the previous error started showing up. What is this keystore_debug file and how do i get it? (HowTos)