Github user daserge commented on a diff in the pull request: https://github.com/apache/cordova-android/pull/276#discussion_r56392123 --- Diff: bin/templates/cordova/lib/emulator.js --- @@ -363,8 +363,14 @@ module.exports.install = function(givenTarget, buildResults) { if (err) reject(new CordovaError('Error executing "' + command + '": ' + stderr)); // adb does not return an error code even if installation fails. Instead it puts a specific // message to stdout, so we have to use RegExp matching to detect installation failure. - else if (/Failure/.test(stdout)) reject(new CordovaError('Failed to install apk to emulator: ' + stdout)); - else resolve(stdout); + else if (/Failure/.test(stdout)) { + if (stdout.match(/INSTALL_PARSE_FAILED_NO_CERTIFICATES/)) { + stdout += 'Sign the build using \'-- --keystore\' or \'--buildConfig\'' + + ' or sign and deploy the unsigned apk manually using Android tools.'; + } + + reject(new CordovaError('Failed to install apk to emulator: ' + stdout)); + } else resolve(stdout); --- End diff -- I agree but this should be probably done along with error codes/messages introducing task (can't find Jira for it; dev list thread: http://apache.markmail.org/thread/qsyocgri3zq6nkrh).
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