There are errors in the console:
Android Build error:
pre+ unzip -qo ./136507/349404/android/plugins/cordova-plugin-purchase-master 2.zip -d ./136507/349404/android/plugins
unzip: cannot find or open ./136507/349404/android/plugins/cordova-plugin-purchase-master, ./136507/349404/android/plugins/cordova-plugin-purchase-master.zip or ./136507/349404/android/plugins/cordova-plugin-purchase-master.ZIP.
Build step 'Execute shell' marked build as failure/pre
the same error for the iOS Build:
preunzip: cannot find or open 136507/349404/ios/plugins/cordova-plugin-purchase-master, 136507/349404/ios/plugins/cordova-plugin-purchase-master.zip or 136507/349404/ios/plugins/cordova-plugin-purchase-master.ZIP.
Build step 'Execute shell' marked build as failure/pre