Error:Attribute “color” has already been defined, update appcompat v-7
问题 I am trying to update my appcompat-v7 in Android Studio project from v20.0.0 to 21.0.0 for use material design component but I allways get the same error: "Error:Attribute "color" has already been defined" I have not idea about what to do for fix this error, I searched in internet but I cant get the answer. Here is my gradle: android { compileOptions.encoding = "iso-8859-1" compileSdkVersion 21 buildToolsVersion "21.1.1" defaultConfig { applicationId "com.test" minSdkVersion 11