<h1 class="gh-header-title mb-2 lh-condensed f1 mr-0 flex-auto break-word" style="box-sizing: border-box; margin: 0px 150px 0px 0px; font-weight: 400; line-height: 1.125; overflow-wrap: break-word; color: #24292e; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji'; background-color: #ffffff; font-size: 32px !important; flex: 1 1 auto !important; word-break: break-word !important;">java.lang.VerifyError: Verifier rejected class com.google.android.gms.auth.api.Auth</h1>

build.gradle app부분 버젼 바꿔주니까 해결됏습니다 이거 때문에 고생했네요

<pre style="background-color: #2b2b2b; color: #a9b7c6; font-family: 'Consolas',monospace; font-size: 15.0pt;">// implementation 'com.google.android.gms:play-services:12.0.1' implementation 'com.google.android.gms:play-services-auth:18.1.0'</pre>

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verifyError 해결

java.lang.VerifyError: Verifier rejected class com.google.android.gms.auth.api.Auth