admin app doesn't work

[ribrdb]

I just followed the deployment guide, but the deployed app wasn't working.
I manually deployed the index.yaml (didn't see this in the guide), and now the app runs but the page looks messed up and I get an error in the javascript console:

[Deprecation] HTML Imports is deprecated and will be removed in M73, around March 2019. Please use ES modules instead. See https://www.chromestatus.com/features/5144752345317376 for more details.
polymer.js:19 [Deprecation] Element.createShadowRoot is deprecated and will be removed in M73, around March 2019. Please use Element.attachShadow instead. See https://www.chromestatus.com/features/4507242028072960 for more details.
(anonymous) @ polymer.js:19
polymer.js:11709 [Deprecation] document.registerElement is deprecated and will be removed in M73, around March 2019. Please use window.customElements.define instead. See https://www.chromestatus.com/features/4642138092470272 for more details.
(anonymous) @ polymer.js:11709
polymer.js:10035 Uncaught DOMException: Failed to execute 'createShadowRoot' on 'Element': Shadow root cannot be created on a host which already hosts a shadow tree.
    at HTMLElement.shadowFromTemplate (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:10035:25)
    at HTMLElement.parseDeclaration (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:10007:25)
    at HTMLElement.parseDeclarations (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:9988:28)
    at HTMLElement.makeElementReady (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:9888:12)
    at HTMLElement.createdCallback (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:9857:14)
    at HTMLElement.registerPrototype (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:11301:28)
    at HTMLElement.register (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:11129:12)
    at HTMLElement._register (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:11637:12)
    at Object.flush (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:11473:28)
    at Object.ready (https://password-monitor.appspot.com/bower_components/polymer/polymer.js:11488:12)
core-overlay.html:348 [Deprecation] /deep/ combinator is no longer supported in CSS dynamic profile.It is now effectively no-op, acting as if it were a descendant combinator. /deep/ combinator will be removed, and will be invalid at M65. You should remove it. See https://www.chromestatus.com/features/4964279606312960 for more details.