Error:Uncaught translation error: com.android.dx.cf.code.SimException: invalid opcode ba (invokedynamic requires --min-sdk-version >= 26)

Found a solution. I fixed this by using the Gradle build option and adding a .gradle file to Plugins/Android/mainTemplate.gradle. The gradle file needs the following:
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}

解决办法： 在App的build.gralde 下添加
compileOptions {//使用JAVA8语法解析
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}

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