我安装android studio并创建一个项目，但我有这个错误：
Error:Unable to resolve dependency for ':app@debug/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.0.0-beta1.
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Error:Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.0.0-beta1.
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Error:Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve junit:junit:4.12.
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Error:Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve com.squareup:javawriter:2.1.1.
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Error:Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve javax.inject:javax.inject:1.
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Error:Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve org.hamcrest:hamcrest-library:1.3.
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Error:Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve org.hamcrest:hamcrest-integration:1.3.
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Error:Unable to resolve dependency for ':app@debugUnitTest/compileClasspath': Could not resolve com.android.support:appcompat-v7:26.0.0-beta1.
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Error:Unable to resolve dependency for ':app@debugAndroidTest/compileClasspath': Could not resolve javax.annotation:javax.annotation-api:1.2.
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这是来源：
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
defaultConfig {
applicationId "com.example.hosein.myapplication"
minSdkVersion 15
targetSdkVersion 26
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
} }}dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:26.0.0-beta1'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:0.5'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:2.2.2'
}